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annotate libinterp/octave-value/ov-null-mat.cc @ 20163:075a5e2e1ba5 stable

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doc: Update more docstrings to have one sentence summary as first line. Reviewed build-aux, libinterp/dldfcn, libinterp/octave-value, libinterp/parse-tree directories. * build-aux/mk-opts.pl, libinterp/dldfcn/__magick_read__.cc, libinterp/dldfcn/amd.cc, libinterp/dldfcn/audiodevinfo.cc, libinterp/dldfcn/audioread.cc, libinterp/dldfcn/ccolamd.cc, libinterp/dldfcn/chol.cc, libinterp/dldfcn/colamd.cc, libinterp/dldfcn/convhulln.cc, libinterp/dldfcn/dmperm.cc, libinterp/dldfcn/fftw.cc, libinterp/dldfcn/qr.cc, libinterp/dldfcn/symbfact.cc, libinterp/dldfcn/symrcm.cc, libinterp/octave-value/ov-base.cc, libinterp/octave-value/ov-bool-mat.cc, libinterp/octave-value/ov-cell.cc, libinterp/octave-value/ov-class.cc, libinterp/octave-value/ov-fcn-handle.cc, libinterp/octave-value/ov-fcn-inline.cc, libinterp/octave-value/ov-java.cc, libinterp/octave-value/ov-null-mat.cc, libinterp/octave-value/ov-oncleanup.cc, libinterp/octave-value/ov-range.cc, libinterp/octave-value/ov-struct.cc, libinterp/octave-value/ov-typeinfo.cc, libinterp/octave-value/ov-usr-fcn.cc, libinterp/octave-value/ov.cc, libinterp/parse-tree/lex.ll, libinterp/parse-tree/oct-parse.in.yy, libinterp/parse-tree/pt-binop.cc, libinterp/parse-tree/pt-eval.cc, libinterp/parse-tree/pt-mat.cc: doc: Update more docstrings to have one sentence summary as first line.
author Rik <rik@octave.org>
date Sun, 03 May 2015 21:52:42 -0700
parents 4197fc428c7d
children
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1 /*
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2
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3 Copyright (C) 2008-2015 Jaroslav Hajek
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4
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5 This file is part of Octave.
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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 the
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9 Free Software Foundation; either version 3 of the License, or (at your
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10 option) any later version.
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11
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12 Octave is distributed in the hope that it will be useful, but WITHOUT
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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15 for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with Octave; see the file COPYING. If not, see
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19 <http://www.gnu.org/licenses/>.
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20
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21 */
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22
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23 #ifdef HAVE_CONFIG_H
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24 #include <config.h>
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25 #endif
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26
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27 #include "ov-null-mat.h"
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28 #include "ops.h"
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29 #include "defun.h"
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30
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31 DEFINE_OV_TYPEID_FUNCTIONS_AND_DATA (octave_null_matrix, "null_matrix",
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32 "double");
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33
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34 const octave_value octave_null_matrix::instance (new octave_null_matrix ());
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35
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36 static octave_base_value *
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37 default_null_matrix_numeric_conversion_function (const octave_base_value& a)
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38 {
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39 // The cast is not necessary?
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40 // CAST_CONV_ARG (const octave_null_matrix&);
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41
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42 return a.empty_clone ();
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43 }
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44
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45 octave_base_value::type_conv_info
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46 octave_null_matrix::numeric_conversion_function (void) const
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47 {
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48 return octave_base_value::type_conv_info
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49 (default_null_matrix_numeric_conversion_function,
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50 octave_matrix::static_type_id ());
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51 }
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52
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53 DEFINE_OV_TYPEID_FUNCTIONS_AND_DATA (octave_null_str, "null_string", "char");
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54
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55 const octave_value octave_null_str::instance (new octave_null_str ());
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56
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57 static octave_base_value *
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58 default_null_str_numeric_conversion_function (const octave_base_value& a)
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59 {
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60 // The cast is not necessary?
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61 // CAST_CONV_ARG (const octave_null_str&);
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62
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63 return a.empty_clone ();
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64 }
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65
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66 octave_base_value::type_conv_info
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67 octave_null_str::numeric_conversion_function (void) const
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68 {
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69 return octave_base_value::type_conv_info
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70 (default_null_str_numeric_conversion_function,
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71 octave_char_matrix_str::static_type_id ());
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72 }
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73
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74 DEFINE_OV_TYPEID_FUNCTIONS_AND_DATA (octave_null_sq_str, "null_sq_string",
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75 "char");
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76
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77 const octave_value octave_null_sq_str::instance (new octave_null_sq_str ());
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78
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79 static octave_base_value *
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80 default_null_sq_str_numeric_conversion_function (const octave_base_value& a)
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81 {
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82 // The cast is not necessary?
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83 // CAST_CONV_ARG (const octave_null_sq_str&);
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84
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85 return a.empty_clone ();
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86 }
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87
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88 octave_base_value::type_conv_info
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89 octave_null_sq_str::numeric_conversion_function (void) const
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90 {
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91 return octave_base_value::type_conv_info
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92 (default_null_sq_str_numeric_conversion_function,
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93 octave_char_matrix_sq_str::static_type_id ());
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94 }
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95
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96 DEFUN (isnull, args, ,
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97 "-*- texinfo -*-\n\
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98 @deftypefn {Built-in Function} {} isnull (@var{x})\n\
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99 Return true if @var{x} is a special null matrix, string, or single quoted\n\
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100 string.\n\
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101 \n\
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102 Indexed assignment with such a value on the right-hand side should delete\n\
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103 array elements. This function should be used when overloading indexed\n\
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104 assignment for user-defined classes instead of @code{isempty}, to\n\
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105 distinguish the cases:\n\
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106 \n\
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107 @table @asis\n\
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108 @item @code{A(I) = []}\n\
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109 This should delete elements if @code{I} is nonempty.\n\
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110 \n\
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111 @item @code{X = []; A(I) = X}\n\
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112 This should give an error if @code{I} is nonempty.\n\
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113 @end table\n\
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114 @seealso{isempty, isindex}\n\
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115 @end deftypefn")
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116 {
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117 octave_value retval;
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118
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119 int nargin = args.length ();
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120
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121 if (nargin == 1 && args(0).is_defined ())
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122 retval = args(0).is_null_value ();
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123 else
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124 print_usage ();
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125
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126 return retval;
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127 }
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128
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129 /*
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130 %!assert (isnull ([]), true)
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131 %!assert (isnull ([1]), false)
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132 %!assert (isnull (zeros (0,3)), false)
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133 %!assert (isnull (""), true)
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134 %!assert (isnull ("A"), false)
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135 %!assert (isnull (''), true)
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136 %!assert (isnull ('A'), false)
ce1fb93d884d codesprint: Add tests for isnull()
Rik <octave@nomad.inbox5.com>
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137 %!test
ce1fb93d884d codesprint: Add tests for isnull()
Rik <octave@nomad.inbox5.com>
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138 %! x = [];
ce1fb93d884d codesprint: Add tests for isnull()
Rik <octave@nomad.inbox5.com>
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139 %! assert (isnull (x), false);
ce1fb93d884d codesprint: Add tests for isnull()
Rik <octave@nomad.inbox5.com>
parents: 11586
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140 */