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use new string_value method to handle value extraction errors * urlwrite.cc: Use new string_value method.
author John W. Eaton <jwe@octave.org>
date Thu, 08 Oct 2015 17:26:40 -0400
parents 4f45eaf83908
children
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1 /*
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2
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3 Copyright (C) 1996-2015 John W. Eaton
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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 "defun.h"
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28 #include "error.h"
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29 #include "gripes.h"
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30 #include "oct-obj.h"
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31 #include "ops.h"
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32 #include "ov-re-diag.h"
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33 #include "ov-cx-diag.h"
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34 #include "ov-flt-re-diag.h"
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35 #include "ov-flt-cx-diag.h"
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36 #include "ov-perm.h"
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37 #include "utils.h"
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38
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39 DEFUN (inv, args, nargout,
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40 "-*- texinfo -*-\n\
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41 @deftypefn {Built-in Function} {@var{x} =} inv (@var{A})\n\
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42 @deftypefnx {Built-in Function} {[@var{x}, @var{rcond}] =} inv (@var{A})\n\
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43 Compute the inverse of the square matrix @var{A}.\n\
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44 \n\
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45 Return an estimate of the reciprocal condition number if requested,\n\
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46 otherwise warn of an ill-conditioned matrix if the reciprocal condition\n\
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47 number is small.\n\
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48 \n\
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49 In general it is best to avoid calculating the inverse of a matrix directly.\n\
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50 For example, it is both faster and more accurate to solve systems of\n\
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51 equations (@var{A}*@math{x} = @math{b}) with\n\
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52 @code{@var{y} = @var{A} \\ @math{b}}, rather than\n\
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53 @code{@var{y} = inv (@var{A}) * @math{b}}.\n\
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54 \n\
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55 If called with a sparse matrix, then in general @var{x} will be a full\n\
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56 matrix requiring significantly more storage. Avoid forming the inverse of a\n\
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57 sparse matrix if possible.\n\
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58 @seealso{ldivide, rdivide}\n\
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59 @end deftypefn")
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60 {
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61 octave_value_list retval;
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62
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63 int nargin = args.length ();
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64
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65 if (nargin != 1)
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66 {
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67 print_usage ();
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68 return retval;
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69 }
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70
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71 octave_value arg = args(0);
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72
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73 octave_idx_type nr = arg.rows ();
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74 octave_idx_type nc = arg.columns ();
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75
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76 int arg_is_empty = empty_arg ("inverse", nr, nc);
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77
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78 if (arg_is_empty < 0)
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79 return retval;
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80 else if (arg_is_empty > 0)
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81 return octave_value (Matrix ());
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82
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83 if (nr != nc)
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84 {
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85 gripe_square_matrix_required ("inverse");
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86 return retval;
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87 }
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88
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89 octave_value result;
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90 octave_idx_type info;
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91 double rcond = 0.0;
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92 float frcond = 0.0;
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93 bool isfloat = arg.is_single_type ();
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94
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95 if (arg.is_diag_matrix ())
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96 {
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97 rcond = 1.0;
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98 frcond = 1.0f;
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99 if (arg.is_complex_type ())
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100 {
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101 if (isfloat)
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102 {
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103 result = arg.float_complex_diag_matrix_value ().inverse (info);
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104 if (nargout > 1)
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105 frcond = arg.float_complex_diag_matrix_value ().rcond ();
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106 }
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107 else
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108 {
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109 result = arg.complex_diag_matrix_value ().inverse (info);
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110 if (nargout > 1)
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111 rcond = arg.complex_diag_matrix_value ().rcond ();
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112 }
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113 }
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114 else
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115 {
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116 if (isfloat)
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117 {
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118 result = arg.float_diag_matrix_value ().inverse (info);
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119 if (nargout > 1)
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120 frcond = arg.float_diag_matrix_value ().rcond ();
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121 }
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122 else
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123 {
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124 result = arg.diag_matrix_value ().inverse (info);
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125 if (nargout > 1)
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126 rcond = arg.diag_matrix_value ().rcond ();
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127 }
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128 }
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129 }
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130 else if (arg.is_perm_matrix ())
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131 {
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132 rcond = 1.0;
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133 info = 0;
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134 result = arg.perm_matrix_value ().inverse ();
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135 }
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136 else if (isfloat)
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137 {
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138 if (arg.is_real_type ())
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139 {
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140 FloatMatrix m = arg.float_matrix_value ();
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141 if (! error_state)
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142 {
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143 MatrixType mattyp = args(0).matrix_type ();
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diff changeset
144 result = m.inverse (mattyp, info, frcond, 1);
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diff changeset
145 args(0).matrix_type (mattyp);
40dfc0c99116 DLD-FUNCTIONS/*.cc: untabify
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parents: 9064
diff changeset
146 }
40dfc0c99116 DLD-FUNCTIONS/*.cc: untabify
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diff changeset
147 }
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diff changeset
148 else if (arg.is_complex_type ())
10154
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diff changeset
149 {
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diff changeset
150 FloatComplexMatrix m = arg.float_complex_matrix_value ();
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diff changeset
151 if (! error_state)
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diff changeset
152 {
40dfc0c99116 DLD-FUNCTIONS/*.cc: untabify
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diff changeset
153 MatrixType mattyp = args(0).matrix_type ();
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diff changeset
154 result = m.inverse (mattyp, info, frcond, 1);
40dfc0c99116 DLD-FUNCTIONS/*.cc: untabify
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diff changeset
155 args(0).matrix_type (mattyp);
40dfc0c99116 DLD-FUNCTIONS/*.cc: untabify
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parents: 9064
diff changeset
156 }
40dfc0c99116 DLD-FUNCTIONS/*.cc: untabify
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diff changeset
157 }
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158 }
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parents: 7650
diff changeset
159 else
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diff changeset
160 {
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parents: 7650
diff changeset
161 if (arg.is_real_type ())
10154
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diff changeset
162 {
40dfc0c99116 DLD-FUNCTIONS/*.cc: untabify
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diff changeset
163 if (arg.is_sparse_type ())
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parents: 9064
diff changeset
164 {
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diff changeset
165 SparseMatrix m = arg.sparse_matrix_value ();
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diff changeset
166 if (! error_state)
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parents: 9064
diff changeset
167 {
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diff changeset
168 MatrixType mattyp = args(0).matrix_type ();
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diff changeset
169 result = m.inverse (mattyp, info, rcond, 1);
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170 args(0).matrix_type (mattyp);
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diff changeset
171 }
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diff changeset
172 }
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diff changeset
173 else
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diff changeset
174 {
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diff changeset
175 Matrix m = arg.matrix_value ();
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diff changeset
176 if (! error_state)
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diff changeset
177 {
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diff changeset
178 MatrixType mattyp = args(0).matrix_type ();
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179 result = m.inverse (mattyp, info, rcond, 1);
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180 args(0).matrix_type (mattyp);
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diff changeset
181 }
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diff changeset
182 }
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diff changeset
183 }
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diff changeset
184 else if (arg.is_complex_type ())
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diff changeset
185 {
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diff changeset
186 if (arg.is_sparse_type ())
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diff changeset
187 {
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diff changeset
188 SparseComplexMatrix m = arg.sparse_complex_matrix_value ();
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diff changeset
189 if (! error_state)
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diff changeset
190 {
40dfc0c99116 DLD-FUNCTIONS/*.cc: untabify
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diff changeset
191 MatrixType mattyp = args(0).matrix_type ();
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diff changeset
192 result = m.inverse (mattyp, info, rcond, 1);
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diff changeset
193 args(0).matrix_type (mattyp);
40dfc0c99116 DLD-FUNCTIONS/*.cc: untabify
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diff changeset
194 }
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diff changeset
195 }
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diff changeset
196 else
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diff changeset
197 {
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diff changeset
198 ComplexMatrix m = arg.complex_matrix_value ();
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diff changeset
199 if (! error_state)
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diff changeset
200 {
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diff changeset
201 MatrixType mattyp = args(0).matrix_type ();
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diff changeset
202 result = m.inverse (mattyp, info, rcond, 1);
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diff changeset
203 args(0).matrix_type (mattyp);
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diff changeset
204 }
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diff changeset
205 }
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diff changeset
206 }
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diff changeset
207 else
10154
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diff changeset
208 gripe_wrong_type_arg ("inv", arg);
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209 }
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diff changeset
210
f3c00dc0912b Eliminate the rest of the dispatched sparse functions
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diff changeset
211 if (! error_state)
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diff changeset
212 {
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diff changeset
213 if (nargout > 1)
10154
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diff changeset
214 retval(1) = isfloat ? octave_value (frcond) : octave_value (rcond);
7515
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diff changeset
215
f3c00dc0912b Eliminate the rest of the dispatched sparse functions
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diff changeset
216 retval(0) = result;
f3c00dc0912b Eliminate the rest of the dispatched sparse functions
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diff changeset
217
18242
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diff changeset
218 bool rcond_plus_one_eq_one = false;
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diff changeset
219
36057e2411f8 test float rcond using float arithmetic in inv function (bug #41065)
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diff changeset
220 if (isfloat)
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diff changeset
221 {
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diff changeset
222 volatile float xrcond = frcond;
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diff changeset
223 rcond_plus_one_eq_one = xrcond + 1.0F == 1.0F;
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diff changeset
224 }
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diff changeset
225 else
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diff changeset
226 {
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diff changeset
227 volatile double xrcond = rcond;
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diff changeset
228 rcond_plus_one_eq_one = xrcond + 1.0 == 1.0;
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diff changeset
229 }
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diff changeset
230
36057e2411f8 test float rcond using float arithmetic in inv function (bug #41065)
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parents: 17787
diff changeset
231 if (nargout < 2 && (info == -1 || rcond_plus_one_eq_one))
19442
a0c7001cf1a8 consistent messages and IDs for singular matrix warnings
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parents: 18244
diff changeset
232 gripe_singular_matrix (isfloat ? frcond : rcond);
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diff changeset
233 }
295f037b4b3e [project @ 1997-05-05 05:32:33 by jwe]
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parents:
diff changeset
234
295f037b4b3e [project @ 1997-05-05 05:32:33 by jwe]
jwe
parents:
diff changeset
235 return retval;
295f037b4b3e [project @ 1997-05-05 05:32:33 by jwe]
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parents:
diff changeset
236 }
295f037b4b3e [project @ 1997-05-05 05:32:33 by jwe]
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parents:
diff changeset
237
7814
87865ed7405f Second set of single precision test code and fix of resulting bugs
David Bateman <dbateman@free.fr>
parents: 7789
diff changeset
238 /*
14501
60e5cf354d80 Update %!tests in DLD-FUNCTIONS/ directory with Octave coding conventions.
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parents: 14138
diff changeset
239 %!assert (inv ([1, 2; 3, 4]), [-2, 1; 1.5, -0.5], sqrt (eps))
60e5cf354d80 Update %!tests in DLD-FUNCTIONS/ directory with Octave coding conventions.
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diff changeset
240 %!assert (inv (single ([1, 2; 3, 4])), single ([-2, 1; 1.5, -0.5]), sqrt (eps ("single")))
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diff changeset
241
14501
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diff changeset
242 %!error inv ()
60e5cf354d80 Update %!tests in DLD-FUNCTIONS/ directory with Octave coding conventions.
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diff changeset
243 %!error inv ([1, 2; 3, 4], 2)
60e5cf354d80 Update %!tests in DLD-FUNCTIONS/ directory with Octave coding conventions.
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diff changeset
244 %!error <argument must be a square matrix> inv ([1, 2; 3, 4; 5, 6])
18242
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diff changeset
245
36057e2411f8 test float rcond using float arithmetic in inv function (bug #41065)
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diff changeset
246 %!test
36057e2411f8 test float rcond using float arithmetic in inv function (bug #41065)
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diff changeset
247 %! [xinv, rcond] = inv (single ([1,2;3,4]));
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diff changeset
248 %! assert (isa (xinv, 'single'));
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diff changeset
249 %! assert (isa (rcond, 'single'));
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diff changeset
250
36057e2411f8 test float rcond using float arithmetic in inv function (bug #41065)
John W. Eaton <jwe@octave.org>
parents: 17787
diff changeset
251 %!test
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diff changeset
252 %! [xinv, rcond] = inv ([1,2;3,4]);
36057e2411f8 test float rcond using float arithmetic in inv function (bug #41065)
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diff changeset
253 %! assert (isa (xinv, 'double'));
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diff changeset
254 %! assert (isa (rcond, 'double'));
14501
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parents: 14138
diff changeset
255 */
7814
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David Bateman <dbateman@free.fr>
parents: 7789
diff changeset
256
17787
175b392e91fe Use GNU style coding conventions for code in libinterp/
Rik <rik@octave.org>
parents: 17744
diff changeset
257 // FIXME: this should really be done with an alias, but
2928
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diff changeset
258 // alias_builtin() won't do the right thing if we are actually using
295f037b4b3e [project @ 1997-05-05 05:32:33 by jwe]
jwe
parents:
diff changeset
259 // dynamic linking.
295f037b4b3e [project @ 1997-05-05 05:32:33 by jwe]
jwe
parents:
diff changeset
260
15039
e753177cde93 maint: Move non-dynamically linked functions from DLD-FUNCTIONS/ to corefcn/ directory
Rik <rik@octave.org>
parents: 14501
diff changeset
261 DEFUN (inverse, args, nargout,
17787
175b392e91fe Use GNU style coding conventions for code in libinterp/
Rik <rik@octave.org>
parents: 17744
diff changeset
262 "-*- texinfo -*-\n\
15039
e753177cde93 maint: Move non-dynamically linked functions from DLD-FUNCTIONS/ to corefcn/ directory
Rik <rik@octave.org>
parents: 14501
diff changeset
263 @deftypefn {Built-in Function} {@var{x} =} inverse (@var{A})\n\
e753177cde93 maint: Move non-dynamically linked functions from DLD-FUNCTIONS/ to corefcn/ directory
Rik <rik@octave.org>
parents: 14501
diff changeset
264 @deftypefnx {Built-in Function} {[@var{x}, @var{rcond}] =} inverse (@var{A})\n\
12546
39ca02387a32 Improve docstrings for a number of functions.
Rik <octave@nomad.inbox5.com>
parents: 11586
diff changeset
265 Compute the inverse of the square matrix @var{A}.\n\
39ca02387a32 Improve docstrings for a number of functions.
Rik <octave@nomad.inbox5.com>
parents: 11586
diff changeset
266 \n\
39ca02387a32 Improve docstrings for a number of functions.
Rik <octave@nomad.inbox5.com>
parents: 11586
diff changeset
267 This is an alias for @code{inv}.\n\
11553
01f703952eff Improve docstrings for functions in DLD-FUNCTIONS directory.
Rik <octave@nomad.inbox5.com>
parents: 11523
diff changeset
268 @seealso{inv}\n\
3458
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parents: 3372
diff changeset
269 @end deftypefn")
2928
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diff changeset
270 {
295f037b4b3e [project @ 1997-05-05 05:32:33 by jwe]
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parents:
diff changeset
271 return Finv (args, nargout);
295f037b4b3e [project @ 1997-05-05 05:32:33 by jwe]
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parents:
diff changeset
272 }