Mercurial > octave
annotate libinterp/corefcn/bitfcns.cc @ 27627:2890a931e647
Deprecated sizemax function (bug #47469).
* scripts/deprecated/sizemax.m: New m-file to produce a warning and provide
sizemax() behavior for the next two Octave releases.
* scripts/deprecated/module.mk: Add sizemax.m to build system.
* bitfcns.cc (Fsizemax): Remove function.
* dim-vector.h (dim_max): Add OCTAVE_DEPRECATED macro to function.
* dim-vector.cc (safe_numel): Call std::numeric_limits<octave_idx_type>::max
rather than dim_max().
* __sprand__.m: Replace sizemax() invocation with new code.
* numbers.txi: Remove DOCSTRING entry for sizemax and add text explaining
actual size limitation imposed by size of index pointers when Octave was
compiled.
author | Rik <rik@octave.org> |
---|---|
date | Mon, 04 Nov 2019 08:09:37 -0800 |
parents | 183c6e9443b5 |
children | 31b95261c7d2 |
rev | line source |
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4908 | 1 /* |
2 | |
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3 Copyright (C) 2004-2019 John W. Eaton |
4908 | 4 |
5 This file is part of Octave. | |
6 | |
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7 Octave is free software: you can redistribute it and/or modify it |
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8 under the terms of the GNU General Public License as published by |
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9 the Free Software Foundation, either version 3 of the License, or |
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10 (at your option) any later version. |
4908 | 11 |
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12 Octave is distributed in the hope that it will be useful, but |
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13 WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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15 GNU General Public License for more details. |
4908 | 16 |
17 You should have received a copy of the GNU General Public License | |
7016 | 18 along with Octave; see the file COPYING. If not, see |
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19 <https://www.gnu.org/licenses/>. |
4908 | 20 |
21 */ | |
22 | |
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23 #if defined (HAVE_CONFIG_H) |
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24 # include "config.h" |
4908 | 25 #endif |
26 | |
17396 | 27 #include <limits> |
28 | |
4908 | 29 #include "str-vec.h" |
30 #include "quit.h" | |
31 | |
32 #include "defun.h" | |
33 #include "error.h" | |
34 #include "ov.h" | |
35 #include "ov-uint64.h" | |
4915 | 36 #include "ov-uint32.h" |
37 #include "ov-uint16.h" | |
38 #include "ov-uint8.h" | |
39 #include "ov-int64.h" | |
40 #include "ov-int32.h" | |
41 #include "ov-int16.h" | |
42 #include "ov-int8.h" | |
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43 #include "ov-float.h" |
4915 | 44 #include "ov-scalar.h" |
45 #include "ov-re-mat.h" | |
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46 #include "ov-bool.h" |
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48 #include <functional> |
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49 |
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50 #if ! defined (HAVE_CXX_BITWISE_OP_TEMPLATES) |
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51 namespace std |
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52 { |
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53 template <typename T> |
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54 struct bit_and |
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55 { |
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56 public: |
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57 T operator() (const T & op1, const T & op2) const { return (op1 & op2); } |
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58 }; |
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59 |
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60 template <typename T> |
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61 struct bit_or |
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62 { |
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63 public: |
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64 T operator() (const T & op1, const T & op2) const { return (op1 | op2); } |
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65 }; |
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66 |
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67 template <typename T> |
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68 struct bit_xor |
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69 { |
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70 public: |
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71 T operator() (const T & op1, const T & op2) const { return (op1 ^ op2); } |
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72 }; |
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73 } |
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74 #endif |
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75 |
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76 template <typename OP, typename T> |
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77 octave_value |
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78 bitopxx (const OP& op, const std::string& fname, |
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79 const Array<T>& x, const Array<T>& y) |
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80 { |
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81 int nelx = x.numel (); |
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82 int nely = y.numel (); |
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83 |
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84 bool is_scalar_op = (nelx == 1 || nely == 1); |
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85 |
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86 dim_vector dvx = x.dims (); |
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87 dim_vector dvy = y.dims (); |
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88 |
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89 bool is_array_op = (dvx == dvy); |
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90 |
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91 if (! is_array_op && ! is_scalar_op) |
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92 error ("%s: size of X and Y must match, or one operand must be a scalar", |
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93 fname.c_str ()); |
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94 |
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95 Array<T> result; |
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96 |
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97 if (nelx != 1) |
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98 result.resize (dvx); |
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99 else |
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100 result.resize (dvy); |
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101 |
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102 for (int i = 0; i < nelx; i++) |
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103 if (is_scalar_op) |
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104 for (int k = 0; k < nely; k++) |
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105 result(i+k) = op (x(i), y(k)); |
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106 else |
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107 result(i) = op (x(i), y(i)); |
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108 |
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109 return result; |
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110 } |
4908 | 111 |
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112 // Trampoline function, instantiates the proper template above, with |
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113 // reflective information hardwired. We can't hardwire this information |
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114 // in Fbitxxx DEFUNs below, because at that moment, we still don't have |
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115 // information about which integer types we need to instantiate. |
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116 template <typename T> |
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117 octave_value |
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118 bitopx (const std::string& fname, const Array<T>& x, const Array<T>& y) |
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119 { |
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120 if (fname == "bitand") |
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121 return bitopxx (std::bit_and<T>(), fname, x, y); |
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122 if (fname == "bitor") |
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123 return bitopxx (std::bit_or<T>(), fname, x, y); |
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124 |
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125 //else (fname == "bitxor") |
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126 return bitopxx (std::bit_xor<T>(), fname, x, y); |
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127 } |
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128 |
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129 static inline int |
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130 bitop_arg_is_int (const octave_value& arg) |
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131 { |
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132 return (arg.class_name () != octave_scalar::static_class_name () |
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133 && arg.class_name () != octave_float_scalar::static_class_name () |
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134 && arg.class_name () != octave_bool::static_class_name ()); |
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135 } |
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136 |
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137 static inline int |
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138 bitop_arg_is_bool (const octave_value& arg) |
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139 { |
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140 return arg.class_name () == octave_bool::static_class_name (); |
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141 } |
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142 |
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143 static inline int |
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144 bitop_arg_is_float (const octave_value& arg) |
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145 { |
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146 return arg.class_name () == octave_float_scalar::static_class_name (); |
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147 } |
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148 |
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149 octave_value |
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150 bitop (const std::string& fname, const octave_value_list& args) |
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151 { |
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152 if (args.length () != 2) |
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153 print_usage (); |
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154 |
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155 octave_value retval; |
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156 |
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157 if (args(0).class_name () == octave_scalar::static_class_name () |
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158 || args(0).class_name () == octave_float_scalar::static_class_name () |
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159 || args(0).class_name () == octave_bool::static_class_name () |
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160 || args(1).class_name () == octave_scalar::static_class_name () |
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161 || args(1).class_name () == octave_float_scalar::static_class_name () |
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162 || args(1).class_name () == octave_bool::static_class_name ()) |
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163 { |
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164 bool arg0_is_int = bitop_arg_is_int (args(0)); |
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165 bool arg1_is_int = bitop_arg_is_int (args(1)); |
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166 |
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167 bool arg0_is_bool = bitop_arg_is_bool (args(0)); |
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168 bool arg1_is_bool = bitop_arg_is_bool (args(1)); |
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169 |
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170 bool arg0_is_float = bitop_arg_is_float (args(0)); |
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171 bool arg1_is_float = bitop_arg_is_float (args(1)); |
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172 |
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173 if (! (arg0_is_int || arg1_is_int)) |
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174 { |
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175 if (arg0_is_bool && arg1_is_bool) |
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176 { |
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177 boolNDArray x (args(0).bool_array_value ()); |
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178 boolNDArray y (args(1).bool_array_value ()); |
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179 |
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180 retval = bitopx (fname, x, y).bool_array_value (); |
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181 } |
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182 else if (arg0_is_float && arg1_is_float) |
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183 { |
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184 uint64NDArray x (args(0).float_array_value ()); |
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185 uint64NDArray y (args(1).float_array_value ()); |
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186 |
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187 retval = bitopx (fname, x, y).float_array_value (); |
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188 } |
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189 else if (! (arg0_is_float || arg1_is_float)) |
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190 { |
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191 uint64NDArray x (args(0).array_value ()); |
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192 uint64NDArray y (args(1).array_value ()); |
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193 |
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194 retval = bitopx (fname, x, y).array_value (); |
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195 } |
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196 else |
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197 { |
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198 int p = (arg0_is_float ? 1 : 0); |
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199 int q = (arg0_is_float ? 0 : 1); |
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200 |
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201 uint64NDArray x (args(p).array_value ()); |
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202 uint64NDArray y (args(q).float_array_value ()); |
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203 |
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204 retval = bitopx (fname, x, y).float_array_value (); |
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205 } |
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206 } |
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207 else |
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208 { |
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209 int p = (arg0_is_int ? 1 : 0); |
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210 int q = (arg0_is_int ? 0 : 1); |
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211 |
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212 NDArray dx = args(p).array_value (); |
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213 |
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214 if (args(q).type_id () == octave_uint64_matrix::static_type_id () |
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215 || args(q).type_id () == octave_uint64_scalar::static_type_id ()) |
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216 { |
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217 uint64NDArray x (dx); |
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218 uint64NDArray y = args(q).uint64_array_value (); |
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219 |
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220 retval = bitopx (fname, x, y); |
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221 } |
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222 else if (args(q).type_id () == octave_uint32_matrix::static_type_id () |
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223 || args(q).type_id () == octave_uint32_scalar::static_type_id ()) |
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224 { |
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225 uint32NDArray x (dx); |
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226 uint32NDArray y = args(q).uint32_array_value (); |
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227 |
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228 retval = bitopx (fname, x, y); |
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229 } |
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230 else if (args(q).type_id () == octave_uint16_matrix::static_type_id () |
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231 || args(q).type_id () == octave_uint16_scalar::static_type_id ()) |
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232 { |
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233 uint16NDArray x (dx); |
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234 uint16NDArray y = args(q).uint16_array_value (); |
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235 |
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236 retval = bitopx (fname, x, y); |
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237 } |
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238 else if (args(q).type_id () == octave_uint8_matrix::static_type_id () |
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239 || args(q).type_id () == octave_uint8_scalar::static_type_id ()) |
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240 { |
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241 uint8NDArray x (dx); |
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242 uint8NDArray y = args(q).uint8_array_value (); |
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243 |
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244 retval = bitopx (fname, x, y); |
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245 } |
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246 else if (args(q).type_id () == octave_int64_matrix::static_type_id () |
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247 || args(q).type_id () == octave_int64_scalar::static_type_id ()) |
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248 { |
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249 int64NDArray x (dx); |
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250 int64NDArray y = args(q).int64_array_value (); |
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251 |
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252 retval = bitopx (fname, x, y); |
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253 } |
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254 else if (args(q).type_id () == octave_int32_matrix::static_type_id () |
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255 || args(q).type_id () == octave_int32_scalar::static_type_id ()) |
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256 { |
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257 int32NDArray x (dx); |
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258 int32NDArray y = args(q).int32_array_value (); |
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259 |
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260 retval = bitopx (fname, x, y); |
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261 } |
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262 else if (args(q).type_id () == octave_int16_matrix::static_type_id () |
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263 || args(q).type_id () == octave_int16_scalar::static_type_id ()) |
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264 { |
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265 int16NDArray x (dx); |
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266 int16NDArray y = args(q).int16_array_value (); |
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267 |
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268 retval = bitopx (fname, x, y); |
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269 } |
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270 else if (args(q).type_id () == octave_int8_matrix::static_type_id () |
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271 || args(q).type_id () == octave_int8_scalar::static_type_id ()) |
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272 { |
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273 int8NDArray x (dx); |
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274 int8NDArray y = args(q).int8_array_value (); |
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275 |
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276 retval = bitopx (fname, x, y); |
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277 } |
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278 else |
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279 error ("%s: invalid operand type", fname.c_str ()); |
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280 } |
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281 } |
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282 else if (args(0).class_name () == args(1).class_name ()) |
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283 { |
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284 if (args(0).type_id () == octave_uint64_matrix::static_type_id () |
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285 || args(0).type_id () == octave_uint64_scalar::static_type_id ()) |
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286 { |
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287 uint64NDArray x = args(0).uint64_array_value (); |
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288 uint64NDArray y = args(1).uint64_array_value (); |
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289 |
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290 retval = bitopx (fname, x, y); |
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291 } |
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292 else if (args(0).type_id () == octave_uint32_matrix::static_type_id () |
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293 || args(0).type_id () == octave_uint32_scalar::static_type_id ()) |
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294 { |
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295 uint32NDArray x = args(0).uint32_array_value (); |
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296 uint32NDArray y = args(1).uint32_array_value (); |
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297 |
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298 retval = bitopx (fname, x, y); |
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299 } |
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300 else if (args(0).type_id () == octave_uint16_matrix::static_type_id () |
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301 || args(0).type_id () == octave_uint16_scalar::static_type_id ()) |
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302 { |
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303 uint16NDArray x = args(0).uint16_array_value (); |
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304 uint16NDArray y = args(1).uint16_array_value (); |
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305 |
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306 retval = bitopx (fname, x, y); |
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307 } |
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308 else if (args(0).type_id () == octave_uint8_matrix::static_type_id () |
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309 || args(0).type_id () == octave_uint8_scalar::static_type_id ()) |
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310 { |
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311 uint8NDArray x = args(0).uint8_array_value (); |
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312 uint8NDArray y = args(1).uint8_array_value (); |
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313 |
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314 retval = bitopx (fname, x, y); |
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315 } |
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316 else if (args(0).type_id () == octave_int64_matrix::static_type_id () |
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317 || args(0).type_id () == octave_int64_scalar::static_type_id ()) |
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318 { |
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319 int64NDArray x = args(0).int64_array_value (); |
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320 int64NDArray y = args(1).int64_array_value (); |
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321 |
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322 retval = bitopx (fname, x, y); |
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323 } |
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324 else if (args(0).type_id () == octave_int32_matrix::static_type_id () |
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325 || args(0).type_id () == octave_int32_scalar::static_type_id ()) |
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326 { |
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327 int32NDArray x = args(0).int32_array_value (); |
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328 int32NDArray y = args(1).int32_array_value (); |
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329 |
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330 retval = bitopx (fname, x, y); |
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331 } |
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332 else if (args(0).type_id () == octave_int16_matrix::static_type_id () |
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333 || args(0).type_id () == octave_int16_scalar::static_type_id ()) |
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334 { |
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335 int16NDArray x = args(0).int16_array_value (); |
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336 int16NDArray y = args(1).int16_array_value (); |
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337 |
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338 retval = bitopx (fname, x, y); |
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339 } |
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340 else if (args(0).type_id () == octave_int8_matrix::static_type_id () |
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341 || args(0).type_id () == octave_int8_scalar::static_type_id ()) |
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342 { |
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343 int8NDArray x = args(0).int8_array_value (); |
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344 int8NDArray y = args(1).int8_array_value (); |
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345 |
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346 retval = bitopx (fname, x, y); |
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347 } |
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348 else |
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349 error ("%s: invalid operand type", fname.c_str ()); |
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350 } |
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351 else |
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352 error ("%s: must have matching operand types", fname.c_str ()); |
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353 |
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354 return retval; |
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355 } |
4908 | 356 |
357 DEFUN (bitand, args, , | |
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358 doc: /* -*- texinfo -*- |
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359 @deftypefn {} {} bitand (@var{x}, @var{y}) |
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360 Return the bitwise AND of non-negative integers. |
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361 |
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362 @var{x}, @var{y} must be in the range [0,intmax] |
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363 @seealso{bitor, bitxor, bitset, bitget, bitcmp, bitshift, intmax, flintmax} |
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364 @end deftypefn */) |
4908 | 365 { |
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366 return bitop ("bitand", args); |
4908 | 367 } |
368 | |
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369 /* |
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370 %!# Function bitand is tested as part of bitxor BIST tests |
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371 */ |
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372 |
4908 | 373 DEFUN (bitor, args, , |
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374 doc: /* -*- texinfo -*- |
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375 @deftypefn {} {} bitor (@var{x}, @var{y}) |
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376 Return the bitwise OR of non-negative integers @var{x} and @var{y}. |
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377 |
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378 @seealso{bitor, bitxor, bitset, bitget, bitcmp, bitshift, intmax, flintmax} |
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379 @end deftypefn */) |
4908 | 380 { |
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381 return bitop ("bitor", args); |
4908 | 382 } |
383 | |
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384 /* |
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385 %!# Function bitor is tested as part of bitxor BIST tests |
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386 */ |
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387 |
4908 | 388 DEFUN (bitxor, args, , |
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389 doc: /* -*- texinfo -*- |
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390 @deftypefn {} {} bitxor (@var{x}, @var{y}) |
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391 Return the bitwise XOR of non-negative integers @var{x} and @var{y}. |
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392 |
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393 @seealso{bitand, bitor, bitset, bitget, bitcmp, bitshift, intmax, flintmax} |
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394 @end deftypefn */) |
4908 | 395 { |
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396 return bitop ("bitxor", args); |
4908 | 397 } |
398 | |
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399 /* |
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400 %!assert (bitand (true, false), false) |
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401 %!assert (bitor (true, false), true) |
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402 %!assert (bitxor (true, false), true) |
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403 |
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404 %!assert (bitand (true, true), true) |
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405 %!assert (bitor (true, true), true) |
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406 %!assert (bitxor (true, true), false) |
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407 |
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408 %!assert (bitand (true, 5), 1) |
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409 |
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410 %!assert (bitand (true, false), false) |
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411 %!assert (bitand (true, true), true) |
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412 %!assert (bitand (true, false), false) |
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413 %!assert (bitand (true, false), false) |
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414 |
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415 ## Test idx_arg.length () == 0 |
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416 %!error <size of X and Y must match> bitand ([0 0 0], [1 0]) |
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417 %!error <size of X and Y must match> bitand ([0; 0; 0], [0 0 0]) |
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418 */ |
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419 |
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420 template <typename T> |
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421 static int64_t |
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422 max_mantissa_value () |
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423 { |
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424 return (static_cast<int64_t> (1) << std::numeric_limits<T>::digits) - 1; |
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425 } |
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426 |
5828 | 427 static int64_t |
428 bitshift (double a, int n, int64_t mask) | |
4908 | 429 { |
6108 | 430 // In the name of bug-for-bug compatibility. |
431 if (a < 0) | |
432 return -bitshift (-a, n, mask); | |
433 | |
4915 | 434 if (n > 0) |
5828 | 435 return (static_cast<int64_t> (a) << n) & mask; |
4915 | 436 else if (n < 0) |
5828 | 437 return (static_cast<int64_t> (a) >> -n) & mask; |
4915 | 438 else |
5828 | 439 return static_cast<int64_t> (a) & mask; |
4908 | 440 } |
441 | |
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442 static int64_t |
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443 bitshift (float a, int n, int64_t mask) |
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444 { |
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445 // In the name of bug-for-bug compatibility. |
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446 if (a < 0) |
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447 return -bitshift (-a, n, mask); |
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448 |
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449 if (n > 0) |
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450 return (static_cast<int64_t> (a) << n) & mask; |
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451 else if (n < 0) |
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452 return (static_cast<int64_t> (a) >> -n) & mask; |
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453 else |
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454 return static_cast<int64_t> (a) & mask; |
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455 } |
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456 |
4919 | 457 // Note that the bitshift operators are undefined if shifted by more |
458 // bits than in the type, so we need to test for the size of the | |
459 // shift. | |
460 | |
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461 #define DO_BITSHIFT(T) \ |
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462 double d1, d2; \ |
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463 \ |
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464 if (! n.all_integers (d1, d2)) \ |
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465 error ("bitshift: K must be a scalar or array of integers"); \ |
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466 \ |
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467 int m_nel = m.numel (); \ |
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468 int n_nel = n.numel (); \ |
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469 \ |
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470 bool is_scalar_op = (m_nel == 1 || n_nel == 1); \ |
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471 \ |
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472 dim_vector m_dv = m.dims (); \ |
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473 dim_vector n_dv = n.dims (); \ |
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474 \ |
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475 bool is_array_op = (m_dv == n_dv); \ |
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476 \ |
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477 if (! is_array_op && ! is_scalar_op) \ |
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478 error ("bitshift: size of A and N must match, or one operand must be a scalar"); \ |
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479 \ |
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480 T ## NDArray result; \ |
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481 \ |
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482 if (m_nel != 1) \ |
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483 result.resize (m_dv); \ |
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484 else \ |
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485 result.resize (n_dv); \ |
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486 \ |
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487 for (int i = 0; i < m_nel; i++) \ |
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488 if (is_scalar_op) \ |
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489 for (int k = 0; k < n_nel; k++) \ |
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490 if (static_cast<int> (n(k)) >= bits_in_type) \ |
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491 result(i+k) = 0; \ |
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492 else \ |
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493 result(i+k) = bitshift (m(i), static_cast<int> (n(k)), mask); \ |
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494 else \ |
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495 if (static_cast<int> (n(i)) >= bits_in_type) \ |
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496 result(i) = 0; \ |
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497 else \ |
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498 result(i) = bitshift (m(i), static_cast<int> (n(i)), mask); \ |
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499 \ |
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500 retval = result; |
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502 #define DO_UBITSHIFT(T, N) \ |
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503 do \ |
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504 { \ |
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505 int bits_in_type = octave_ ## T :: nbits (); \ |
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506 T ## NDArray m = m_arg.T ## _array_value (); \ |
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507 octave_ ## T mask = octave_ ## T::max (); \ |
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508 if ((N) < bits_in_type) \ |
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509 mask = bitshift (mask, (N) - bits_in_type); \ |
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510 else if ((N) < 1) \ |
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511 mask = 0; \ |
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512 DO_BITSHIFT (T); \ |
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513 } \ |
4915 | 514 while (0) |
515 | |
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516 #define DO_SBITSHIFT(T, N) \ |
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517 do \ |
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518 { \ |
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519 int bits_in_type = octave_ ## T :: nbits (); \ |
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520 T ## NDArray m = m_arg.T ## _array_value (); \ |
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521 octave_ ## T mask = octave_ ## T::max (); \ |
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522 if ((N) < bits_in_type) \ |
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523 mask = bitshift (mask, (N) - bits_in_type); \ |
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524 else if ((N) < 1) \ |
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525 mask = 0; \ |
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526 /* FIXME: 2's complement only? */ \ |
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527 mask = mask | octave_ ## T :: min (); \ |
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528 DO_BITSHIFT (T); \ |
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529 } \ |
4908 | 530 while (0) |
531 | |
532 DEFUN (bitshift, args, , | |
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533 doc: /* -*- texinfo -*- |
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534 @deftypefn {} {} bitshift (@var{a}, @var{k}) |
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535 @deftypefnx {} {} bitshift (@var{a}, @var{k}, @var{n}) |
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536 Return a @var{k} bit shift of @var{n}-digit unsigned integers in @var{a}. |
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537 |
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538 A positive @var{k} leads to a left shift; A negative value to a right shift. |
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539 |
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540 If @var{n} is omitted it defaults to 64. |
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541 @var{n} must be in the range [1,64]. |
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542 |
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543 @example |
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544 @group |
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545 bitshift (eye (3), 1) |
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546 @result{} |
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547 @group |
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548 2 0 0 |
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549 0 2 0 |
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550 0 0 2 |
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551 @end group |
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552 |
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553 bitshift (10, [-2, -1, 0, 1, 2]) |
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554 @result{} 2 5 10 20 40 |
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555 @c FIXME: restore this example when third arg is allowed to be an array. |
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556 @c |
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557 @c |
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558 @c bitshift ([1, 10], 2, [3,4]) |
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559 @c @result{} 4 8 |
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560 @end group |
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561 @end example |
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562 @seealso{bitand, bitor, bitxor, bitset, bitget, bitcmp, intmax, flintmax} |
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563 @end deftypefn */) |
4908 | 564 { |
565 int nargin = args.length (); | |
566 | |
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567 if (nargin < 2 || nargin > 3) |
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568 print_usage (); |
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569 |
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570 NDArray n = args(1).xarray_value ("bitshift: K must be a scalar or array of integers"); |
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571 |
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572 int nbits = 64; |
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573 |
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574 if (nargin == 3) |
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575 { |
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576 // FIXME: for compatibility, we should accept an array or a scalar |
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577 // as the third argument. |
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578 if (args(2).numel () > 1) |
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579 error ("bitshift: N must be a scalar integer"); |
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580 |
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581 nbits = args(2).xint_value ("bitshift: N must be an integer"); |
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582 |
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583 if (nbits < 0) |
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584 error ("bitshift: N must be positive"); |
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585 } |
4915 | 586 |
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587 octave_value retval; |
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588 |
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589 octave_value m_arg = args(0); |
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590 std::string cname = m_arg.class_name (); |
4908 | 591 |
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592 if (cname == "double") |
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593 { |
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594 static const int bits_in_mantissa |
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595 = std::numeric_limits<double>::digits; |
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596 |
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597 nbits = (nbits < bits_in_mantissa ? nbits : bits_in_mantissa); |
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598 int64_t mask = max_mantissa_value<double> (); |
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599 if (nbits < bits_in_mantissa) |
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600 mask = mask >> (bits_in_mantissa - nbits); |
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601 int bits_in_type = sizeof (double) |
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602 * std::numeric_limits<unsigned char>::digits; |
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603 NDArray m = m_arg.array_value (); |
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604 DO_BITSHIFT (); |
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605 } |
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606 else if (cname == "uint8") |
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607 DO_UBITSHIFT (uint8, nbits < 8 ? nbits : 8); |
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608 else if (cname == "uint16") |
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609 DO_UBITSHIFT (uint16, nbits < 16 ? nbits : 16); |
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610 else if (cname == "uint32") |
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611 DO_UBITSHIFT (uint32, nbits < 32 ? nbits : 32); |
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612 else if (cname == "uint64") |
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613 DO_UBITSHIFT (uint64, nbits < 64 ? nbits : 64); |
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614 else if (cname == "int8") |
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615 DO_SBITSHIFT (int8, nbits < 8 ? nbits : 8); |
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616 else if (cname == "int16") |
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617 DO_SBITSHIFT (int16, nbits < 16 ? nbits : 16); |
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618 else if (cname == "int32") |
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619 DO_SBITSHIFT (int32, nbits < 32 ? nbits : 32); |
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620 else if (cname == "int64") |
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621 DO_SBITSHIFT (int64, nbits < 64 ? nbits : 64); |
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622 else if (cname == "single") |
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623 { |
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624 static const int bits_in_mantissa |
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625 = std::numeric_limits<float>::digits; |
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626 nbits = (nbits < bits_in_mantissa ? nbits : bits_in_mantissa); |
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627 int64_t mask = max_mantissa_value<float> (); |
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628 if (nbits < bits_in_mantissa) |
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629 mask = mask >> (bits_in_mantissa - nbits); |
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630 int bits_in_type = sizeof (float) |
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631 * std::numeric_limits<unsigned char>::digits; |
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632 FloatNDArray m = m_arg.float_array_value (); |
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633 DO_BITSHIFT (Float); |
4908 | 634 } |
635 else | |
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636 error ("bitshift: not defined for %s objects", cname.c_str ()); |
4908 | 637 |
638 return retval; | |
639 } | |
640 | |
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641 /* |
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642 %!assert (bitshift (uint8 (16), 1), uint8 ( 32)) |
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643 %!assert (bitshift (uint16 (16), 2), uint16 ( 64)) |
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644 %!assert (bitshift (uint32 (16), 3), uint32 (128)) |
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645 %!assert (bitshift (uint64 (16), 4), uint64 (256)) |
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646 %!assert (bitshift (uint8 (255), 1), uint8 (254)) |
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647 |
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648 %!error <K must be a scalar or array of integers> bitshift (16, 1.5) |
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649 %!error bitshift (16, {1}) |
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650 %!error <N must be a scalar integer> bitshift (10, [-2 -1 0 1 2], [1 1 1 1 1]) |
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651 %!error <N must be positive> bitshift (10, [-2 -1 0 1 2], -1) |
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652 */ |
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653 |
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654 DEFUN (flintmax, args, , |
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655 doc: /* -*- texinfo -*- |
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656 @deftypefn {} {} flintmax () |
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657 @deftypefnx {} {} flintmax ("double") |
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658 @deftypefnx {} {} flintmax ("single") |
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659 @deftypefnx {} {} flintmax (@var{var}) |
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660 Return the largest integer that can be represented consecutively in a |
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661 floating point value. |
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662 |
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663 The input is either a string specifying a floating point type, or it is an |
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664 existing floating point variable @var{var}. |
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665 |
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666 The default type is @qcode{"double"}, but @qcode{"single"} is a valid option. |
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667 On IEEE 754 compatible systems, @code{flintmax} is @w{@math{2^{53}}} for |
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668 @qcode{"double"} and @w{@math{2^{24}}} for @qcode{"single"}. |
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669 |
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670 Example Code - query an existing variable |
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671 |
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672 @example |
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673 @group |
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674 x = single (1); |
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675 flintmax (x) |
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676 @result{} 16777216 |
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677 @end group |
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678 @end example |
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679 |
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680 @seealso{intmax, realmax, realmin} |
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681 @end deftypefn */) |
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682 { |
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683 int nargin = args.length (); |
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684 |
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685 if (nargin > 1) |
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686 print_usage (); |
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687 |
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688 std::string cname = "double"; |
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689 if (nargin == 1) |
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690 { |
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691 if (args(0).is_string ()) |
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692 cname = args(0).string_value (); |
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693 else if (args(0).isfloat ()) |
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694 cname = args(0).class_name (); |
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695 else |
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696 error ("intmin: argument must be a string or floating point variable"); |
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697 } |
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698 |
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699 if (cname == "double") |
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700 return ovl (static_cast<double> (max_mantissa_value<double> () + 1)); |
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701 else if (cname == "single") |
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702 return ovl (static_cast<float> (max_mantissa_value<float> () + 1)); |
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703 else |
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704 error ("flintmax: not defined for class '%s'", cname.c_str ()); |
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705 } |
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706 |
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707 /* |
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708 %!assert (flintmax (), 2^53) |
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709 %!assert (flintmax ("double"), 2^53) |
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710 %!assert (flintmax ("single"), single (2^24)) |
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711 |
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712 %!test |
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713 %! x = single (1); |
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714 %! assert (flintmax (x), single (16777216)); |
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715 |
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716 %!error flintmax ("double", 0) |
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717 %!error <must be a string or floating point variable> flintmax (int8 (1)) |
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718 %!error <not defined for class 'int8'> flintmax ("int8") |
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719 %!error <not defined for class 'char'> flintmax ("char") |
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720 */ |
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721 |
4915 | 722 DEFUN (intmax, args, , |
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723 doc: /* -*- texinfo -*- |
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724 @deftypefn {} {} intmax () |
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725 @deftypefnx {} {} intmax ("@var{type}") |
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726 @deftypefnx {} {} intmax (@var{var}) |
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727 Return the largest integer that can be represented by a specific integer type. |
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728 |
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729 The input is either a string @qcode{"@var{type}"} specifying an integer type, |
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730 or it is an existing integer variable @var{var}. |
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731 |
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732 Possible values for @var{type} are |
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733 |
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734 @table @asis |
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735 @item @qcode{"int8"} |
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736 signed 8-bit integer. |
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737 |
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738 @item @qcode{"int16"} |
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739 signed 16-bit integer. |
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740 |
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741 @item @qcode{"int32"} |
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742 signed 32-bit integer. |
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743 |
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744 @item @qcode{"int64"} |
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745 signed 64-bit integer. |
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746 |
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747 @item @qcode{"uint8"} |
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748 unsigned 8-bit integer. |
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749 |
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750 @item @qcode{"uint16"} |
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751 unsigned 16-bit integer. |
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752 |
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753 @item @qcode{"uint32"} |
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754 unsigned 32-bit integer. |
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|
755 |
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756 @item @qcode{"uint64"} |
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757 unsigned 64-bit integer. |
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758 @end table |
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759 |
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760 The default for @var{type} is @qcode{"int32"}. |
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761 |
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762 Example Code - query an existing variable |
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763 |
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764 @example |
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765 @group |
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766 x = int8 (1); |
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767 intmax (x) |
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768 @result{} 127 |
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769 @end group |
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770 @end example |
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771 |
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772 @seealso{intmin, flintmax} |
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773 @end deftypefn */) |
4908 | 774 { |
4915 | 775 int nargin = args.length (); |
776 | |
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777 if (nargin > 1) |
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778 print_usage (); |
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779 |
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780 std::string cname = "int32"; |
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781 if (nargin == 1) |
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782 { |
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783 if (args(0).is_string ()) |
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784 cname = args(0).string_value (); |
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785 else if (args(0).isinteger ()) |
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786 cname = args(0).class_name (); |
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787 else |
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788 error ("intmax: argument must be a string or integer variable"); |
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789 } |
4915 | 790 |
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791 octave_value retval; |
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792 |
4915 | 793 if (cname == "uint8") |
5828 | 794 retval = octave_uint8 (std::numeric_limits<uint8_t>::max ()); |
4915 | 795 else if (cname == "uint16") |
5828 | 796 retval = octave_uint16 (std::numeric_limits<uint16_t>::max ()); |
4915 | 797 else if (cname == "uint32") |
5828 | 798 retval = octave_uint32 (std::numeric_limits<uint32_t>::max ()); |
4915 | 799 else if (cname == "uint64") |
5828 | 800 retval = octave_uint64 (std::numeric_limits<uint64_t>::max ()); |
4915 | 801 else if (cname == "int8") |
5828 | 802 retval = octave_int8 (std::numeric_limits<int8_t>::max ()); |
4915 | 803 else if (cname == "int16") |
5828 | 804 retval = octave_int16 (std::numeric_limits<int16_t>::max ()); |
4915 | 805 else if (cname == "int32") |
5828 | 806 retval = octave_int32 (std::numeric_limits<int32_t>::max ()); |
4915 | 807 else if (cname == "int64") |
5828 | 808 retval = octave_int64 (std::numeric_limits<int64_t>::max ()); |
4915 | 809 else |
810 error ("intmax: not defined for '%s' objects", cname.c_str ()); | |
811 | |
812 return retval; | |
813 } | |
814 | |
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815 /* |
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816 %!assert (intmax (), int32 (2^31 - 1)) |
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817 %!assert (intmax ("int8"), int8 (2^7 - 1)) |
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818 %!assert (intmax ("uint8"), uint8 (2^8 - 1)) |
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819 %!assert (intmax ("int16"), int16 (2^15 - 1)) |
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820 %!assert (intmax ("uint16"), uint16 (2^16 - 1)) |
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821 %!assert (intmax ("int32"), int32 (2^31 - 1)) |
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822 %!assert (intmax ("uint32"), uint32 (2^32 - 1)) |
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823 %!assert (intmax ("int64"), int64 (2^63 - 1)) |
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824 %!assert (intmax ("uint64"), uint64 (2^64 - 1)) |
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825 |
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826 %!test |
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827 %! x = int8 (1); |
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828 %! assert (intmax (x), int8 (127)); |
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829 |
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830 %!error intmax ("int32", 0) |
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831 %!error <must be a string or integer variable> intmax (1.0) |
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832 %!error <not defined for 'double' objects> intmax ("double") |
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833 %!error <not defined for 'char' objects> intmax ("char") |
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834 */ |
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835 |
4915 | 836 DEFUN (intmin, args, , |
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837 doc: /* -*- texinfo -*- |
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838 @deftypefn {} {} intmin () |
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839 @deftypefnx {} {} intmin ("@var{type}") |
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840 @deftypefnx {} {} intmin (@var{var}) |
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841 Return the smallest integer that can be represented by a specific integer type. |
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842 |
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843 The input is either a string @qcode{"@var{type}"} specifying an integer type, |
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844 or it is an existing integer variable @var{var}. |
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845 |
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846 Possible values for @var{type} are |
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847 |
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848 @table @asis |
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849 @item @qcode{"int8"} |
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850 signed 8-bit integer. |
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851 |
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852 @item @qcode{"int16"} |
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853 signed 16-bit integer. |
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854 |
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855 @item @qcode{"int32"} |
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856 signed 32-bit integer. |
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857 |
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858 @item @qcode{"int64"} |
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859 signed 64-bit integer. |
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860 |
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861 @item @qcode{"uint8"} |
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862 unsigned 8-bit integer. |
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863 |
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864 @item @qcode{"uint16"} |
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865 unsigned 16-bit integer. |
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866 |
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867 @item @qcode{"uint32"} |
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868 unsigned 32-bit integer. |
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869 |
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870 @item @qcode{"uint64"} |
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871 unsigned 64-bit integer. |
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872 @end table |
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873 |
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874 The default for @var{type} is @qcode{"int32"}. |
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875 |
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876 Example Code - query an existing variable |
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877 |
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878 @example |
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879 @group |
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880 x = int8 (1); |
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881 intmin (x) |
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882 @result{} -128 |
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883 @end group |
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884 @end example |
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885 |
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886 @seealso{intmax, flintmax} |
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887 @end deftypefn */) |
4915 | 888 { |
889 int nargin = args.length (); | |
890 | |
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891 if (nargin > 1) |
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892 print_usage (); |
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893 |
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894 std::string cname = "int32"; |
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895 if (nargin == 1) |
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896 { |
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897 if (args(0).is_string ()) |
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898 cname = args(0).string_value (); |
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899 else if (args(0).isinteger ()) |
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900 cname = args(0).class_name (); |
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901 else |
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902 error ("intmin: argument must be a string or integer variable"); |
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903 } |
4915 | 904 |
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905 octave_value retval; |
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906 |
4915 | 907 if (cname == "uint8") |
5828 | 908 retval = octave_uint8 (std::numeric_limits<uint8_t>::min ()); |
4915 | 909 else if (cname == "uint16") |
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910 retval = octave_uint16 (std::numeric_limits<uint16_t>::min ()); |
4915 | 911 else if (cname == "uint32") |
5828 | 912 retval = octave_uint32 (std::numeric_limits<uint32_t>::min ()); |
4915 | 913 else if (cname == "uint64") |
5828 | 914 retval = octave_uint64 (std::numeric_limits<uint64_t>::min ()); |
4915 | 915 else if (cname == "int8") |
5828 | 916 retval = octave_int8 (std::numeric_limits<int8_t>::min ()); |
4915 | 917 else if (cname == "int16") |
5828 | 918 retval = octave_int16 (std::numeric_limits<int16_t>::min ()); |
4915 | 919 else if (cname == "int32") |
5828 | 920 retval = octave_int32 (std::numeric_limits<int32_t>::min ()); |
4915 | 921 else if (cname == "int64") |
5828 | 922 retval = octave_int64 (std::numeric_limits<int64_t>::min ()); |
4915 | 923 else |
924 error ("intmin: not defined for '%s' objects", cname.c_str ()); | |
925 | |
4908 | 926 return retval; |
927 } | |
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928 |
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929 /* |
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930 %!assert (intmin (), int32 (-2^31)) |
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931 %!assert (intmin ("int8"), int8 (-2^7)) |
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932 %!assert (intmin ("uint8"), uint8 (-2^8)) |
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933 %!assert (intmin ("int16"), int16 (-2^15)) |
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934 %!assert (intmin ("uint16"), uint16 (-2^16)) |
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935 %!assert (intmin ("int32"), int32 (-2^31)) |
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936 %!assert (intmin ("uint32"), uint32 (-2^32)) |
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937 %!assert (intmin ("int64"), int64 (-2^63)) |
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938 %!assert (intmin ("uint64"), uint64 (-2^64)) |
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939 |
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940 %!test |
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941 %! x = int8 (1); |
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942 %! assert (intmin (x), int8 (-128)); |
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943 |
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944 %!error intmin ("int32", 0) |
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945 %!error <must be a string or integer variable> intmin (1.0) |
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946 %!error <not defined for 'double' objects> intmin ("double") |
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947 %!error <not defined for 'char' objects> intmin ("char") |
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948 */ |