Mercurial > octave
annotate libinterp/corefcn/bitfcns.cc @ 29958:32c3a5805893
move DEFUN and DEFMETHOD functions inside octave namespace
* mk-opts.pl: Surround emitted function definitions with
OCTAVE_NAMESPACE_BEGIN and OCTAVE_NAMESPACE_END tags.
* mk-builtins.pl: Surround emitted function declarations with
OCTAVE_NAMESPACE_BEGIN and OCTAVE_NAMESPACE_END tags. Emit deprecated
global inline functions.
* __betainc__.cc, __contourc__.cc, __dsearchn__.cc, __eigs__.cc,
__expint__.cc, __ftp__.cc, __gammainc__.cc, __ichol__.cc, __ilu__.cc,
__lin_interpn__.cc, __magick_read__.cc, __pchip_deriv__.cc, __qp__.cc,
amd.cc, balance.cc, besselj.cc, bitfcns.cc, bsxfun.cc, call-stack.cc,
ccolamd.cc, cellfun.cc, chol.cc, colamd.cc, colloc.cc, conv2.cc,
daspk.cc, dasrt.cc, dassl.cc, data.cc, debug.cc, defaults.cc,
defun.cc, det.cc, dirfns.cc, display.cc, dlmread.cc, dmperm.cc,
dot.cc, eig.cc, ellipj.cc, environment.cc, error.cc, event-manager.cc,
fcn-info.cc, fft.cc, fft2.cc, fftn.cc, file-io.cc, filter.cc, find.cc,
gcd.cc, getgrent.cc, getpwent.cc, getrusage.cc, givens.cc,
graphics.cc, gsvd.cc, hash.cc, help.cc, hess.cc, hex2num.cc, input.cc,
interpreter.cc, inv.cc, jsondecode.cc, jsonencode.cc, kron.cc,
load-path.cc, load-save.cc, lookup.cc, ls-oct-text.cc, lsode.cc,
lu.cc, mappers.cc, matrix_type.cc, max.cc, mgorth.cc, nproc.cc,
oct-hist.cc, ordqz.cc, ordschur.cc, pager.cc, pinv.cc, pr-flt-fmt.cc,
pr-output.cc, psi.cc, qr.cc, quad.cc, quadcc.cc, qz.cc, rand.cc,
rcond.cc, regexp.cc, schur.cc, settings.cc, sighandlers.cc, sparse.cc,
spparms.cc, sqrtm.cc, stream-euler.cc, strfind.cc, strfns.cc,
sub2ind.cc, svd.cc, sylvester.cc, symbfact.cc, symrcm.cc, symtab.cc,
syscalls.cc, sysdep.cc, time.cc, toplev.cc, tril.cc, tsearch.cc,
typecast.cc, urlwrite.cc, utils.cc, variables.cc, __delaunayn__.cc,
__fltk_uigetfile__.cc, __glpk__.cc, __init_gnuplot__.cc, __ode15__.cc,
__voronoi__.cc, audiodevinfo.cc, audioread.cc, convhulln.cc, fftw.cc,
gzip.cc, ov-base.cc, ov-bool-mat.cc, ov-cell.cc, ov-class.cc,
ov-classdef.cc, ov-fcn-handle.cc, ov-java.cc, ov-null-mat.cc,
ov-oncleanup.cc, ov-struct.cc, ov-typeinfo.cc, ov-usr-fcn.cc, ov.cc,
octave.cc, lex.ll, oct-parse.yy, profiler.cc, pt-eval.cc: Surround
DEFUN and DEFMETHOD function defnitions with OCTAVE_NAMESPACE_BEGIN
and OCTAVE_NAMESPACE_END tags.
author | John W. Eaton <jwe@octave.org> |
---|---|
date | Fri, 13 Aug 2021 21:53:51 -0400 |
parents | 0a5b15007766 |
children | a61e1a0f6024 |
rev | line source |
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1 //////////////////////////////////////////////////////////////////////// |
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2 // |
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3 // Copyright (C) 2004-2021 The Octave Project Developers |
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4 // |
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5 // See the file COPYRIGHT.md in the top-level directory of this |
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6 // distribution or <https://octave.org/copyright/>. |
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7 // |
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8 // This file is part of Octave. |
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9 // |
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10 // Octave is free software: you can redistribute it and/or modify it |
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11 // under the terms of the GNU General Public License as published by |
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12 // the Free Software Foundation, either version 3 of the License, or |
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13 // (at your option) any later version. |
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14 // |
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15 // Octave is distributed in the hope that it will be useful, but |
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16 // WITHOUT ANY WARRANTY; without even the implied warranty of |
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17 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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18 // GNU General Public License for more details. |
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19 // |
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20 // You should have received a copy of the GNU General Public License |
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21 // along with Octave; see the file COPYING. If not, see |
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22 // <https://www.gnu.org/licenses/>. |
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23 // |
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24 //////////////////////////////////////////////////////////////////////// |
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26 #if defined (HAVE_CONFIG_H) |
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27 # include "config.h" |
4908 | 28 #endif |
29 | |
17396 | 30 #include <limits> |
31 | |
4908 | 32 #include "str-vec.h" |
33 #include "quit.h" | |
34 | |
35 #include "defun.h" | |
36 #include "error.h" | |
37 #include "ov.h" | |
38 #include "ov-uint64.h" | |
4915 | 39 #include "ov-uint32.h" |
40 #include "ov-uint16.h" | |
41 #include "ov-uint8.h" | |
42 #include "ov-int64.h" | |
43 #include "ov-int32.h" | |
44 #include "ov-int16.h" | |
45 #include "ov-int8.h" | |
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46 #include "ov-float.h" |
4915 | 47 #include "ov-scalar.h" |
48 #include "ov-re-mat.h" | |
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49 #include "ov-bool.h" |
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51 #include <functional> |
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52 |
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53 #if ! defined (HAVE_CXX_BITWISE_OP_TEMPLATES) |
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54 namespace std |
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55 { |
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56 template <typename T> |
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57 struct bit_and |
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58 { |
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59 public: |
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60 T operator() (const T & op1, const T & op2) const { return (op1 & op2); } |
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61 }; |
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62 |
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63 template <typename T> |
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64 struct bit_or |
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65 { |
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66 public: |
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67 T operator() (const T & op1, const T & op2) const { return (op1 | op2); } |
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68 }; |
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69 |
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70 template <typename T> |
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71 struct bit_xor |
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72 { |
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73 public: |
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74 T operator() (const T & op1, const T & op2) const { return (op1 ^ op2); } |
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75 }; |
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76 } |
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77 #endif |
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78 |
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79 OCTAVE_NAMESPACE_BEGIN |
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80 |
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81 template <typename OP, typename T> |
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82 octave_value |
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83 bitopxx (const OP& op, const std::string& fname, |
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84 const Array<T>& x, const Array<T>& y) |
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85 { |
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86 int nelx = x.numel (); |
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87 int nely = y.numel (); |
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88 |
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89 bool is_scalar_op = (nelx == 1 || nely == 1); |
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90 |
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91 dim_vector dvx = x.dims (); |
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92 dim_vector dvy = y.dims (); |
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93 |
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94 bool is_array_op = (dvx == dvy); |
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95 |
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96 if (! is_array_op && ! is_scalar_op) |
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97 error ("%s: size of X and Y must match, or one operand must be a scalar", |
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98 fname.c_str ()); |
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99 |
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100 Array<T> result; |
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101 |
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102 if (nelx != 1) |
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103 result.resize (dvx); |
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104 else |
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105 result.resize (dvy); |
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106 |
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107 for (int i = 0; i < nelx; i++) |
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108 if (is_scalar_op) |
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109 for (int k = 0; k < nely; k++) |
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110 result(i+k) = op (x(i), y(k)); |
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111 else |
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112 result(i) = op (x(i), y(i)); |
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113 |
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114 return result; |
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115 } |
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117 // Trampoline function, instantiates the proper template above, with |
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118 // reflective information hardwired. We can't hardwire this information |
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119 // in Fbitxxx DEFUNs below, because at that moment, we still don't have |
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120 // information about which integer types we need to instantiate. |
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121 template <typename T> |
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122 octave_value |
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123 bitopx (const std::string& fname, const Array<T>& x, const Array<T>& y) |
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124 { |
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125 if (fname == "bitand") |
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126 return bitopxx (std::bit_and<T>(), fname, x, y); |
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127 if (fname == "bitor") |
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128 return bitopxx (std::bit_or<T>(), fname, x, y); |
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129 |
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130 //else (fname == "bitxor") |
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131 return bitopxx (std::bit_xor<T>(), fname, x, y); |
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132 } |
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133 |
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134 static inline int |
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135 bitop_arg_is_int (const octave_value& arg) |
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136 { |
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137 return (arg.class_name () != octave_scalar::static_class_name () |
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138 && arg.class_name () != octave_float_scalar::static_class_name () |
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139 && arg.class_name () != octave_bool::static_class_name ()); |
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140 } |
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141 |
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142 static inline int |
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143 bitop_arg_is_bool (const octave_value& arg) |
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144 { |
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145 return arg.class_name () == octave_bool::static_class_name (); |
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146 } |
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147 |
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148 static inline int |
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149 bitop_arg_is_float (const octave_value& arg) |
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150 { |
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151 return arg.class_name () == octave_float_scalar::static_class_name (); |
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152 } |
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153 |
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154 octave_value |
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155 bitop (const std::string& fname, const octave_value_list& args) |
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156 { |
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157 if (args.length () != 2) |
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158 print_usage (); |
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159 |
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160 octave_value retval; |
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161 |
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162 if (args(0).class_name () == octave_scalar::static_class_name () |
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163 || args(0).class_name () == octave_float_scalar::static_class_name () |
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164 || args(0).class_name () == octave_bool::static_class_name () |
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165 || args(1).class_name () == octave_scalar::static_class_name () |
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166 || args(1).class_name () == octave_float_scalar::static_class_name () |
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167 || args(1).class_name () == octave_bool::static_class_name ()) |
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168 { |
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169 bool arg0_is_int = bitop_arg_is_int (args(0)); |
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170 bool arg1_is_int = bitop_arg_is_int (args(1)); |
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171 |
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172 bool arg0_is_bool = bitop_arg_is_bool (args(0)); |
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173 bool arg1_is_bool = bitop_arg_is_bool (args(1)); |
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174 |
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175 bool arg0_is_float = bitop_arg_is_float (args(0)); |
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176 bool arg1_is_float = bitop_arg_is_float (args(1)); |
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177 |
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178 if (! (arg0_is_int || arg1_is_int)) |
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179 { |
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180 if (arg0_is_bool && arg1_is_bool) |
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181 { |
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182 boolNDArray x (args(0).bool_array_value ()); |
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183 boolNDArray y (args(1).bool_array_value ()); |
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184 |
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185 retval = bitopx (fname, x, y).bool_array_value (); |
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186 } |
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187 else if (arg0_is_float && arg1_is_float) |
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188 { |
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189 uint64NDArray x (args(0).float_array_value ()); |
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190 uint64NDArray y (args(1).float_array_value ()); |
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191 |
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192 retval = bitopx (fname, x, y).float_array_value (); |
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193 } |
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194 else if (! (arg0_is_float || arg1_is_float)) |
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195 { |
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196 uint64NDArray x (args(0).array_value ()); |
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197 uint64NDArray y (args(1).array_value ()); |
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198 |
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199 retval = bitopx (fname, x, y).array_value (); |
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200 } |
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201 else |
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202 { |
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203 int p = (arg0_is_float ? 1 : 0); |
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204 int q = (arg0_is_float ? 0 : 1); |
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205 |
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206 uint64NDArray x (args(p).array_value ()); |
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207 uint64NDArray y (args(q).float_array_value ()); |
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208 |
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209 retval = bitopx (fname, x, y).float_array_value (); |
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210 } |
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211 } |
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212 else |
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213 { |
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214 int p = (arg0_is_int ? 1 : 0); |
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215 int q = (arg0_is_int ? 0 : 1); |
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216 |
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217 NDArray dx = args(p).array_value (); |
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218 |
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219 if (args(q).type_id () == octave_uint64_matrix::static_type_id () |
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220 || args(q).type_id () == octave_uint64_scalar::static_type_id ()) |
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221 { |
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222 uint64NDArray x (dx); |
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223 uint64NDArray y = args(q).uint64_array_value (); |
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224 |
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225 retval = bitopx (fname, x, y); |
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226 } |
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227 else if (args(q).type_id () == octave_uint32_matrix::static_type_id () |
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228 || args(q).type_id () == octave_uint32_scalar::static_type_id ()) |
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229 { |
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230 uint32NDArray x (dx); |
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231 uint32NDArray y = args(q).uint32_array_value (); |
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232 |
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233 retval = bitopx (fname, x, y); |
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234 } |
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235 else if (args(q).type_id () == octave_uint16_matrix::static_type_id () |
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236 || args(q).type_id () == octave_uint16_scalar::static_type_id ()) |
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237 { |
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238 uint16NDArray x (dx); |
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239 uint16NDArray y = args(q).uint16_array_value (); |
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240 |
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241 retval = bitopx (fname, x, y); |
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242 } |
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243 else if (args(q).type_id () == octave_uint8_matrix::static_type_id () |
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244 || args(q).type_id () == octave_uint8_scalar::static_type_id ()) |
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245 { |
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246 uint8NDArray x (dx); |
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247 uint8NDArray y = args(q).uint8_array_value (); |
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248 |
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249 retval = bitopx (fname, x, y); |
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250 } |
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251 else if (args(q).type_id () == octave_int64_matrix::static_type_id () |
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252 || args(q).type_id () == octave_int64_scalar::static_type_id ()) |
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253 { |
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254 int64NDArray x (dx); |
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255 int64NDArray y = args(q).int64_array_value (); |
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256 |
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257 retval = bitopx (fname, x, y); |
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258 } |
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259 else if (args(q).type_id () == octave_int32_matrix::static_type_id () |
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260 || args(q).type_id () == octave_int32_scalar::static_type_id ()) |
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261 { |
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262 int32NDArray x (dx); |
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263 int32NDArray y = args(q).int32_array_value (); |
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264 |
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265 retval = bitopx (fname, x, y); |
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266 } |
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267 else if (args(q).type_id () == octave_int16_matrix::static_type_id () |
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268 || args(q).type_id () == octave_int16_scalar::static_type_id ()) |
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269 { |
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270 int16NDArray x (dx); |
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271 int16NDArray y = args(q).int16_array_value (); |
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272 |
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273 retval = bitopx (fname, x, y); |
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274 } |
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275 else if (args(q).type_id () == octave_int8_matrix::static_type_id () |
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276 || args(q).type_id () == octave_int8_scalar::static_type_id ()) |
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277 { |
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278 int8NDArray x (dx); |
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279 int8NDArray y = args(q).int8_array_value (); |
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280 |
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281 retval = bitopx (fname, x, y); |
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282 } |
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283 else |
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284 error ("%s: invalid operand type", fname.c_str ()); |
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285 } |
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286 } |
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287 else if (args(0).class_name () == args(1).class_name ()) |
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288 { |
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289 if (args(0).type_id () == octave_uint64_matrix::static_type_id () |
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290 || args(0).type_id () == octave_uint64_scalar::static_type_id ()) |
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291 { |
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292 uint64NDArray x = args(0).uint64_array_value (); |
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293 uint64NDArray y = args(1).uint64_array_value (); |
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294 |
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295 retval = bitopx (fname, x, y); |
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296 } |
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297 else if (args(0).type_id () == octave_uint32_matrix::static_type_id () |
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298 || args(0).type_id () == octave_uint32_scalar::static_type_id ()) |
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299 { |
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300 uint32NDArray x = args(0).uint32_array_value (); |
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301 uint32NDArray y = args(1).uint32_array_value (); |
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302 |
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303 retval = bitopx (fname, x, y); |
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304 } |
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305 else if (args(0).type_id () == octave_uint16_matrix::static_type_id () |
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306 || args(0).type_id () == octave_uint16_scalar::static_type_id ()) |
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307 { |
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308 uint16NDArray x = args(0).uint16_array_value (); |
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309 uint16NDArray y = args(1).uint16_array_value (); |
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310 |
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311 retval = bitopx (fname, x, y); |
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312 } |
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313 else if (args(0).type_id () == octave_uint8_matrix::static_type_id () |
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314 || args(0).type_id () == octave_uint8_scalar::static_type_id ()) |
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315 { |
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316 uint8NDArray x = args(0).uint8_array_value (); |
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317 uint8NDArray y = args(1).uint8_array_value (); |
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318 |
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319 retval = bitopx (fname, x, y); |
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320 } |
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321 else if (args(0).type_id () == octave_int64_matrix::static_type_id () |
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322 || args(0).type_id () == octave_int64_scalar::static_type_id ()) |
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323 { |
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324 int64NDArray x = args(0).int64_array_value (); |
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325 int64NDArray y = args(1).int64_array_value (); |
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326 |
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327 retval = bitopx (fname, x, y); |
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328 } |
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329 else if (args(0).type_id () == octave_int32_matrix::static_type_id () |
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330 || args(0).type_id () == octave_int32_scalar::static_type_id ()) |
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331 { |
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332 int32NDArray x = args(0).int32_array_value (); |
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333 int32NDArray y = args(1).int32_array_value (); |
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334 |
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335 retval = bitopx (fname, x, y); |
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336 } |
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337 else if (args(0).type_id () == octave_int16_matrix::static_type_id () |
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338 || args(0).type_id () == octave_int16_scalar::static_type_id ()) |
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339 { |
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340 int16NDArray x = args(0).int16_array_value (); |
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341 int16NDArray y = args(1).int16_array_value (); |
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342 |
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343 retval = bitopx (fname, x, y); |
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344 } |
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345 else if (args(0).type_id () == octave_int8_matrix::static_type_id () |
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346 || args(0).type_id () == octave_int8_scalar::static_type_id ()) |
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347 { |
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348 int8NDArray x = args(0).int8_array_value (); |
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349 int8NDArray y = args(1).int8_array_value (); |
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350 |
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351 retval = bitopx (fname, x, y); |
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352 } |
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353 else |
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354 error ("%s: invalid operand type", fname.c_str ()); |
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355 } |
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356 else |
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357 error ("%s: must have matching operand types", fname.c_str ()); |
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358 |
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359 return retval; |
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360 } |
4908 | 361 |
362 DEFUN (bitand, args, , | |
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363 doc: /* -*- texinfo -*- |
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364 @deftypefn {} {} bitand (@var{x}, @var{y}) |
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365 Return the bitwise AND of non-negative integers. |
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366 |
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367 @var{x}, @var{y} must be in the range [0,intmax] |
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368 @seealso{bitor, bitxor, bitset, bitget, bitcmp, bitshift, intmax, flintmax} |
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369 @end deftypefn */) |
4908 | 370 { |
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371 return bitop ("bitand", args); |
4908 | 372 } |
373 | |
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374 /* |
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375 %!# Function bitand is tested as part of bitxor BIST tests |
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376 */ |
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377 |
4908 | 378 DEFUN (bitor, args, , |
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379 doc: /* -*- texinfo -*- |
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380 @deftypefn {} {} bitor (@var{x}, @var{y}) |
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381 Return the bitwise OR of non-negative integers @var{x} and @var{y}. |
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382 |
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383 @seealso{bitor, bitxor, bitset, bitget, bitcmp, bitshift, intmax, flintmax} |
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384 @end deftypefn */) |
4908 | 385 { |
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386 return bitop ("bitor", args); |
4908 | 387 } |
388 | |
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389 /* |
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390 %!# Function bitor is tested as part of bitxor BIST tests |
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391 */ |
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392 |
4908 | 393 DEFUN (bitxor, args, , |
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394 doc: /* -*- texinfo -*- |
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395 @deftypefn {} {} bitxor (@var{x}, @var{y}) |
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396 Return the bitwise XOR of non-negative integers @var{x} and @var{y}. |
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397 |
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398 @seealso{bitand, bitor, bitset, bitget, bitcmp, bitshift, intmax, flintmax} |
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399 @end deftypefn */) |
4908 | 400 { |
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401 return bitop ("bitxor", args); |
4908 | 402 } |
403 | |
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404 /* |
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405 %!assert (bitand (true, false), false) |
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406 %!assert (bitor (true, false), true) |
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407 %!assert (bitxor (true, false), true) |
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408 |
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409 %!assert (bitand (true, true), true) |
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410 %!assert (bitor (true, true), true) |
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411 %!assert (bitxor (true, true), false) |
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412 |
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413 %!assert (bitand (true, 5), 1) |
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414 |
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415 %!assert (bitand (true, false), false) |
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416 %!assert (bitand (true, true), true) |
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417 %!assert (bitand (true, false), false) |
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418 %!assert (bitand (true, false), false) |
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419 |
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420 ## Test idx_arg.length () == 0 |
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421 %!error <size of X and Y must match> bitand ([0 0 0], [1 0]) |
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422 %!error <size of X and Y must match> bitand ([0; 0; 0], [0 0 0]) |
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423 */ |
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424 |
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425 template <typename T> |
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426 static int64_t |
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427 max_mantissa_value () |
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428 { |
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429 return (static_cast<int64_t> (1) << std::numeric_limits<T>::digits) - 1; |
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430 } |
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431 |
5828 | 432 static int64_t |
433 bitshift (double a, int n, int64_t mask) | |
4908 | 434 { |
6108 | 435 // In the name of bug-for-bug compatibility. |
436 if (a < 0) | |
437 return -bitshift (-a, n, mask); | |
438 | |
4915 | 439 if (n > 0) |
5828 | 440 return (static_cast<int64_t> (a) << n) & mask; |
4915 | 441 else if (n < 0) |
5828 | 442 return (static_cast<int64_t> (a) >> -n) & mask; |
4915 | 443 else |
5828 | 444 return static_cast<int64_t> (a) & mask; |
4908 | 445 } |
446 | |
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447 static int64_t |
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448 bitshift (float a, int n, int64_t mask) |
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449 { |
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450 // In the name of bug-for-bug compatibility. |
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451 if (a < 0) |
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452 return -bitshift (-a, n, mask); |
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453 |
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454 if (n > 0) |
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455 return (static_cast<int64_t> (a) << n) & mask; |
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456 else if (n < 0) |
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457 return (static_cast<int64_t> (a) >> -n) & mask; |
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458 else |
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459 return static_cast<int64_t> (a) & mask; |
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460 } |
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461 |
4919 | 462 // Note that the bitshift operators are undefined if shifted by more |
463 // bits than in the type, so we need to test for the size of the | |
464 // shift. | |
465 | |
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466 #define DO_BITSHIFT(T) \ |
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467 double d1, d2; \ |
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468 \ |
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469 if (! n.all_integers (d1, d2)) \ |
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470 error ("bitshift: K must be a scalar or array of integers"); \ |
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471 \ |
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472 int m_nel = m.numel (); \ |
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473 int n_nel = n.numel (); \ |
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474 \ |
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475 bool is_scalar_op = (m_nel == 1 || n_nel == 1); \ |
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476 \ |
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477 dim_vector m_dv = m.dims (); \ |
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478 dim_vector n_dv = n.dims (); \ |
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479 \ |
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480 bool is_array_op = (m_dv == n_dv); \ |
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481 \ |
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482 if (! is_array_op && ! is_scalar_op) \ |
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483 error ("bitshift: size of A and N must match, or one operand must be a scalar"); \ |
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484 \ |
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485 T ## NDArray result; \ |
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486 \ |
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487 if (m_nel != 1) \ |
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488 result.resize (m_dv); \ |
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489 else \ |
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490 result.resize (n_dv); \ |
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491 \ |
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492 for (int i = 0; i < m_nel; i++) \ |
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493 if (is_scalar_op) \ |
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494 for (int k = 0; k < n_nel; k++) \ |
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495 if (static_cast<int> (n(k)) >= bits_in_type) \ |
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496 result(i+k) = 0; \ |
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497 else \ |
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498 result(i+k) = bitshift (m(i), static_cast<int> (n(k)), mask); \ |
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499 else \ |
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500 if (static_cast<int> (n(i)) >= bits_in_type) \ |
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501 result(i) = 0; \ |
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502 else \ |
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503 result(i) = bitshift (m(i), static_cast<int> (n(i)), mask); \ |
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504 \ |
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505 retval = result; |
4915 | 506 |
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507 #define DO_UBITSHIFT(T, N) \ |
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508 do \ |
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509 { \ |
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510 int bits_in_type = octave_ ## T :: nbits (); \ |
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511 T ## NDArray m = m_arg.T ## _array_value (); \ |
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512 octave_ ## T mask = octave_ ## T::max (); \ |
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513 if ((N) < bits_in_type) \ |
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514 mask = bitshift (mask, (N) - bits_in_type); \ |
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515 else if ((N) < 1) \ |
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516 mask = 0; \ |
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517 DO_BITSHIFT (T); \ |
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518 } \ |
4915 | 519 while (0) |
520 | |
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521 #define DO_SBITSHIFT(T, N) \ |
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522 do \ |
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523 { \ |
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524 int bits_in_type = octave_ ## T :: nbits (); \ |
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525 T ## NDArray m = m_arg.T ## _array_value (); \ |
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526 octave_ ## T mask = octave_ ## T::max (); \ |
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527 if ((N) < bits_in_type) \ |
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528 mask = bitshift (mask, (N) - bits_in_type); \ |
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529 else if ((N) < 1) \ |
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530 mask = 0; \ |
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531 /* FIXME: 2's complement only? */ \ |
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532 mask = mask | octave_ ## T :: min (); \ |
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533 DO_BITSHIFT (T); \ |
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534 } \ |
4908 | 535 while (0) |
536 | |
537 DEFUN (bitshift, args, , | |
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538 doc: /* -*- texinfo -*- |
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539 @deftypefn {} {} bitshift (@var{a}, @var{k}) |
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540 @deftypefnx {} {} bitshift (@var{a}, @var{k}, @var{n}) |
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541 Return a @var{k} bit shift of @var{n}-digit unsigned integers in @var{a}. |
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542 |
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543 A positive @var{k} leads to a left shift; A negative value to a right shift. |
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544 |
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545 If @var{n} is omitted it defaults to 64. |
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546 @var{n} must be in the range [1,64]. |
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547 |
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548 @example |
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549 @group |
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550 bitshift (eye (3), 1) |
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551 @result{} |
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552 @group |
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553 2 0 0 |
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554 0 2 0 |
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555 0 0 2 |
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556 @end group |
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557 |
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558 bitshift (10, [-2, -1, 0, 1, 2]) |
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559 @result{} 2 5 10 20 40 |
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560 @c FIXME: restore this example when third arg is allowed to be an array. |
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561 @c |
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562 @c |
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563 @c bitshift ([1, 10], 2, [3,4]) |
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564 @c @result{} 4 8 |
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565 @end group |
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566 @end example |
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567 @seealso{bitand, bitor, bitxor, bitset, bitget, bitcmp, intmax, flintmax} |
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568 @end deftypefn */) |
4908 | 569 { |
570 int nargin = args.length (); | |
571 | |
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572 if (nargin < 2 || nargin > 3) |
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573 print_usage (); |
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574 |
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575 NDArray n = args(1).xarray_value ("bitshift: K must be a scalar or array of integers"); |
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576 |
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577 int nbits = 64; |
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578 |
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579 if (nargin == 3) |
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580 { |
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581 // FIXME: for compatibility, we should accept an array or a scalar |
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582 // as the third argument. |
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583 if (args(2).numel () > 1) |
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584 error ("bitshift: N must be a scalar integer"); |
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585 |
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586 nbits = args(2).xint_value ("bitshift: N must be an integer"); |
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587 |
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588 if (nbits < 0) |
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589 error ("bitshift: N must be positive"); |
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590 } |
4915 | 591 |
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592 octave_value retval; |
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593 |
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594 octave_value m_arg = args(0); |
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595 std::string cname = m_arg.class_name (); |
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597 if (cname == "double") |
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598 { |
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599 static const int bits_in_mantissa |
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600 = std::numeric_limits<double>::digits; |
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601 |
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602 nbits = (nbits < bits_in_mantissa ? nbits : bits_in_mantissa); |
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603 int64_t mask = max_mantissa_value<double> (); |
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604 if (nbits < bits_in_mantissa) |
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605 mask = mask >> (bits_in_mantissa - nbits); |
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606 int bits_in_type = sizeof (double) |
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607 * std::numeric_limits<unsigned char>::digits; |
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608 NDArray m = m_arg.array_value (); |
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609 DO_BITSHIFT (); |
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610 } |
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611 else if (cname == "uint8") |
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612 DO_UBITSHIFT (uint8, nbits < 8 ? nbits : 8); |
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613 else if (cname == "uint16") |
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614 DO_UBITSHIFT (uint16, nbits < 16 ? nbits : 16); |
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615 else if (cname == "uint32") |
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616 DO_UBITSHIFT (uint32, nbits < 32 ? nbits : 32); |
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617 else if (cname == "uint64") |
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618 DO_UBITSHIFT (uint64, nbits < 64 ? nbits : 64); |
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619 else if (cname == "int8") |
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620 DO_SBITSHIFT (int8, nbits < 8 ? nbits : 8); |
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621 else if (cname == "int16") |
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622 DO_SBITSHIFT (int16, nbits < 16 ? nbits : 16); |
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623 else if (cname == "int32") |
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624 DO_SBITSHIFT (int32, nbits < 32 ? nbits : 32); |
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625 else if (cname == "int64") |
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626 DO_SBITSHIFT (int64, nbits < 64 ? nbits : 64); |
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627 else if (cname == "single") |
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628 { |
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629 static const int bits_in_mantissa |
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630 = std::numeric_limits<float>::digits; |
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631 nbits = (nbits < bits_in_mantissa ? nbits : bits_in_mantissa); |
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632 int64_t mask = max_mantissa_value<float> (); |
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633 if (nbits < bits_in_mantissa) |
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634 mask = mask >> (bits_in_mantissa - nbits); |
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635 int bits_in_type = sizeof (float) |
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636 * std::numeric_limits<unsigned char>::digits; |
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637 FloatNDArray m = m_arg.float_array_value (); |
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638 DO_BITSHIFT (Float); |
4908 | 639 } |
640 else | |
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641 error ("bitshift: not defined for %s objects", cname.c_str ()); |
4908 | 642 |
643 return retval; | |
644 } | |
645 | |
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646 /* |
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647 %!assert (bitshift (uint8 (16), 1), uint8 ( 32)) |
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648 %!assert (bitshift (uint16 (16), 2), uint16 ( 64)) |
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649 %!assert (bitshift (uint32 (16), 3), uint32 (128)) |
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650 %!assert (bitshift (uint64 (16), 4), uint64 (256)) |
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651 %!assert (bitshift (uint8 (255), 1), uint8 (254)) |
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652 |
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653 %!error <K must be a scalar or array of integers> bitshift (16, 1.5) |
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654 %!error bitshift (16, {1}) |
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655 %!error <N must be a scalar integer> bitshift (10, [-2 -1 0 1 2], [1 1 1 1 1]) |
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656 %!error <N must be positive> bitshift (10, [-2 -1 0 1 2], -1) |
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657 */ |
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658 |
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659 DEFUN (flintmax, args, , |
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660 doc: /* -*- texinfo -*- |
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661 @deftypefn {} {} flintmax () |
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662 @deftypefnx {} {} flintmax ("double") |
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663 @deftypefnx {} {} flintmax ("single") |
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664 @deftypefnx {} {} flintmax (@var{var}) |
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665 Return the largest integer that can be represented consecutively in a |
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666 floating point value. |
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667 |
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668 The input is either a string specifying a floating point type, or it is an |
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669 existing floating point variable @var{var}. |
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670 |
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671 The default type is @qcode{"double"}, but @qcode{"single"} is a valid option. |
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672 On IEEE 754 compatible systems, @code{flintmax} is @w{@math{2^{53}}} for |
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673 @qcode{"double"} and @w{@math{2^{24}}} for @qcode{"single"}. |
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674 |
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675 Example Code - query an existing variable |
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676 |
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677 @example |
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678 @group |
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679 x = single (1); |
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680 flintmax (x) |
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681 @result{} 16777216 |
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682 @end group |
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683 @end example |
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684 |
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685 @seealso{intmax, realmax, realmin} |
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686 @end deftypefn */) |
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687 { |
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688 int nargin = args.length (); |
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689 |
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690 if (nargin > 1) |
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691 print_usage (); |
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692 |
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693 std::string cname = "double"; |
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694 if (nargin == 1) |
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695 { |
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696 if (args(0).is_string ()) |
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697 cname = args(0).string_value (); |
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698 else if (args(0).isfloat ()) |
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699 cname = args(0).class_name (); |
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700 else |
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701 error ("intmin: argument must be a string or floating point variable"); |
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702 } |
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703 |
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704 if (cname == "double") |
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705 return ovl (static_cast<double> (max_mantissa_value<double> () + 1)); |
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706 else if (cname == "single") |
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707 return ovl (static_cast<float> (max_mantissa_value<float> () + 1)); |
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708 else |
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709 error ("flintmax: not defined for class '%s'", cname.c_str ()); |
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710 } |
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711 |
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712 /* |
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713 %!assert (flintmax (), 2^53) |
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714 %!assert (flintmax ("double"), 2^53) |
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715 %!assert (flintmax ("single"), single (2^24)) |
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716 |
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717 %!test |
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718 %! x = single (1); |
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719 %! assert (flintmax (x), single (16777216)); |
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720 |
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721 %!error flintmax ("double", 0) |
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722 %!error <must be a string or floating point variable> flintmax (int8 (1)) |
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723 %!error <not defined for class 'int8'> flintmax ("int8") |
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724 %!error <not defined for class 'char'> flintmax ("char") |
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725 */ |
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726 |
4915 | 727 DEFUN (intmax, args, , |
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728 doc: /* -*- texinfo -*- |
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729 @deftypefn {} {} intmax () |
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730 @deftypefnx {} {} intmax ("@var{type}") |
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731 @deftypefnx {} {} intmax (@var{var}) |
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732 Return the largest integer that can be represented by a specific integer type. |
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733 |
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734 The input is either a string @qcode{"@var{type}"} specifying an integer type, |
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735 or it is an existing integer variable @var{var}. |
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736 |
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737 Possible values for @var{type} are |
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738 |
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739 @table @asis |
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740 @item @qcode{"int8"} |
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741 signed 8-bit integer. |
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742 |
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743 @item @qcode{"int16"} |
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744 signed 16-bit integer. |
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745 |
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746 @item @qcode{"int32"} |
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747 signed 32-bit integer. |
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748 |
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749 @item @qcode{"int64"} |
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750 signed 64-bit integer. |
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751 |
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752 @item @qcode{"uint8"} |
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753 unsigned 8-bit integer. |
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754 |
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755 @item @qcode{"uint16"} |
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756 unsigned 16-bit integer. |
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757 |
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758 @item @qcode{"uint32"} |
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759 unsigned 32-bit integer. |
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760 |
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761 @item @qcode{"uint64"} |
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762 unsigned 64-bit integer. |
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763 @end table |
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764 |
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765 The default for @var{type} is @qcode{"int32"}. |
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766 |
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767 Example Code - query an existing variable |
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768 |
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769 @example |
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770 @group |
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771 x = int8 (1); |
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772 intmax (x) |
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773 @result{} 127 |
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774 @end group |
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775 @end example |
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776 |
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777 @seealso{intmin, flintmax} |
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778 @end deftypefn */) |
4908 | 779 { |
4915 | 780 int nargin = args.length (); |
781 | |
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782 if (nargin > 1) |
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783 print_usage (); |
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784 |
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785 std::string cname = "int32"; |
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786 if (nargin == 1) |
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787 { |
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788 if (args(0).is_string ()) |
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789 cname = args(0).string_value (); |
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790 else if (args(0).isinteger ()) |
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791 cname = args(0).class_name (); |
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792 else |
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793 error ("intmax: argument must be a string or integer variable"); |
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794 } |
4915 | 795 |
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796 octave_value retval; |
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797 |
4915 | 798 if (cname == "uint8") |
5828 | 799 retval = octave_uint8 (std::numeric_limits<uint8_t>::max ()); |
4915 | 800 else if (cname == "uint16") |
5828 | 801 retval = octave_uint16 (std::numeric_limits<uint16_t>::max ()); |
4915 | 802 else if (cname == "uint32") |
5828 | 803 retval = octave_uint32 (std::numeric_limits<uint32_t>::max ()); |
4915 | 804 else if (cname == "uint64") |
5828 | 805 retval = octave_uint64 (std::numeric_limits<uint64_t>::max ()); |
4915 | 806 else if (cname == "int8") |
5828 | 807 retval = octave_int8 (std::numeric_limits<int8_t>::max ()); |
4915 | 808 else if (cname == "int16") |
5828 | 809 retval = octave_int16 (std::numeric_limits<int16_t>::max ()); |
4915 | 810 else if (cname == "int32") |
5828 | 811 retval = octave_int32 (std::numeric_limits<int32_t>::max ()); |
4915 | 812 else if (cname == "int64") |
5828 | 813 retval = octave_int64 (std::numeric_limits<int64_t>::max ()); |
4915 | 814 else |
815 error ("intmax: not defined for '%s' objects", cname.c_str ()); | |
816 | |
817 return retval; | |
818 } | |
819 | |
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820 /* |
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821 %!assert (intmax (), int32 (2^31 - 1)) |
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822 %!assert (intmax ("int8"), int8 (2^7 - 1)) |
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823 %!assert (intmax ("uint8"), uint8 (2^8 - 1)) |
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824 %!assert (intmax ("int16"), int16 (2^15 - 1)) |
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825 %!assert (intmax ("uint16"), uint16 (2^16 - 1)) |
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826 %!assert (intmax ("int32"), int32 (2^31 - 1)) |
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827 %!assert (intmax ("uint32"), uint32 (2^32 - 1)) |
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828 %!assert (intmax ("int64"), int64 (2^63 - 1)) |
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829 %!assert (intmax ("uint64"), uint64 (2^64 - 1)) |
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830 |
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831 %!test |
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832 %! x = int8 (1); |
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833 %! assert (intmax (x), int8 (127)); |
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834 |
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835 %!error intmax ("int32", 0) |
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836 %!error <must be a string or integer variable> intmax (1.0) |
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837 %!error <not defined for 'double' objects> intmax ("double") |
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838 %!error <not defined for 'char' objects> intmax ("char") |
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839 */ |
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840 |
4915 | 841 DEFUN (intmin, args, , |
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842 doc: /* -*- texinfo -*- |
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843 @deftypefn {} {} intmin () |
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844 @deftypefnx {} {} intmin ("@var{type}") |
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845 @deftypefnx {} {} intmin (@var{var}) |
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846 Return the smallest integer that can be represented by a specific integer type. |
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847 |
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848 The input is either a string @qcode{"@var{type}"} specifying an integer type, |
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849 or it is an existing integer variable @var{var}. |
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850 |
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851 Possible values for @var{type} are |
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852 |
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853 @table @asis |
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854 @item @qcode{"int8"} |
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855 signed 8-bit integer. |
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856 |
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857 @item @qcode{"int16"} |
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858 signed 16-bit integer. |
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859 |
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860 @item @qcode{"int32"} |
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861 signed 32-bit integer. |
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862 |
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863 @item @qcode{"int64"} |
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864 signed 64-bit integer. |
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865 |
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866 @item @qcode{"uint8"} |
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867 unsigned 8-bit integer. |
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868 |
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869 @item @qcode{"uint16"} |
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870 unsigned 16-bit integer. |
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871 |
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872 @item @qcode{"uint32"} |
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873 unsigned 32-bit integer. |
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874 |
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875 @item @qcode{"uint64"} |
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876 unsigned 64-bit integer. |
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877 @end table |
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878 |
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879 The default for @var{type} is @qcode{"int32"}. |
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880 |
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881 Example Code - query an existing variable |
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882 |
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883 @example |
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884 @group |
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885 x = int8 (1); |
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886 intmin (x) |
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887 @result{} -128 |
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888 @end group |
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889 @end example |
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890 |
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891 @seealso{intmax, flintmax} |
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892 @end deftypefn */) |
4915 | 893 { |
894 int nargin = args.length (); | |
895 | |
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896 if (nargin > 1) |
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897 print_usage (); |
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898 |
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899 std::string cname = "int32"; |
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900 if (nargin == 1) |
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901 { |
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902 if (args(0).is_string ()) |
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903 cname = args(0).string_value (); |
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904 else if (args(0).isinteger ()) |
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905 cname = args(0).class_name (); |
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906 else |
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907 error ("intmin: argument must be a string or integer variable"); |
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908 } |
4915 | 909 |
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910 octave_value retval; |
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911 |
4915 | 912 if (cname == "uint8") |
5828 | 913 retval = octave_uint8 (std::numeric_limits<uint8_t>::min ()); |
4915 | 914 else if (cname == "uint16") |
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915 retval = octave_uint16 (std::numeric_limits<uint16_t>::min ()); |
4915 | 916 else if (cname == "uint32") |
5828 | 917 retval = octave_uint32 (std::numeric_limits<uint32_t>::min ()); |
4915 | 918 else if (cname == "uint64") |
5828 | 919 retval = octave_uint64 (std::numeric_limits<uint64_t>::min ()); |
4915 | 920 else if (cname == "int8") |
5828 | 921 retval = octave_int8 (std::numeric_limits<int8_t>::min ()); |
4915 | 922 else if (cname == "int16") |
5828 | 923 retval = octave_int16 (std::numeric_limits<int16_t>::min ()); |
4915 | 924 else if (cname == "int32") |
5828 | 925 retval = octave_int32 (std::numeric_limits<int32_t>::min ()); |
4915 | 926 else if (cname == "int64") |
5828 | 927 retval = octave_int64 (std::numeric_limits<int64_t>::min ()); |
4915 | 928 else |
929 error ("intmin: not defined for '%s' objects", cname.c_str ()); | |
930 | |
4908 | 931 return retval; |
932 } | |
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933 |
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934 /* |
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935 %!assert (intmin (), int32 (-2^31)) |
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936 %!assert (intmin ("int8"), int8 (-2^7)) |
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937 %!assert (intmin ("uint8"), uint8 (-2^8)) |
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938 %!assert (intmin ("int16"), int16 (-2^15)) |
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939 %!assert (intmin ("uint16"), uint16 (-2^16)) |
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940 %!assert (intmin ("int32"), int32 (-2^31)) |
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941 %!assert (intmin ("uint32"), uint32 (-2^32)) |
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942 %!assert (intmin ("int64"), int64 (-2^63)) |
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943 %!assert (intmin ("uint64"), uint64 (-2^64)) |
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944 |
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945 %!test |
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946 %! x = int8 (1); |
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947 %! assert (intmin (x), int8 (-128)); |
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948 |
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949 %!error intmin ("int32", 0) |
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950 %!error <must be a string or integer variable> intmin (1.0) |
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951 %!error <not defined for 'double' objects> intmin ("double") |
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952 %!error <not defined for 'char' objects> intmin ("char") |
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953 */ |
27880
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954 |
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955 DEFUN (sizemax, args, , |
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956 doc: /* -*- texinfo -*- |
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957 @deftypefn {} {} sizemax () |
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958 Return the largest value allowed for the size of an array. |
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959 |
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960 If Octave is compiled with 64-bit indexing, the result is of class int64, |
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961 otherwise it is of class int32. The maximum array size is slightly |
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962 smaller than the maximum value allowable for the relevant class as reported |
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963 by @code{intmax}. |
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964 @seealso{intmax} |
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965 @end deftypefn */) |
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966 { |
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967 if (args.length () != 0) |
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968 print_usage (); |
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969 |
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970 return octave_value (octave_int<octave_idx_type> (dim_vector::dim_max ())); |
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971 } |
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972 |
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973 /* |
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974 %!assert (sizemax () >= (intmax ("int32") - 1)) |
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975 |
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976 %!error sizemax (0) |
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977 */ |
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978 |
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979 OCTAVE_NAMESPACE_END |