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1 // f-svd.cc -*- C++ -*- |
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2 /* |
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3 |
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4 Copyright (C) 1993 John W. Eaton |
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5 |
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6 This file is part of Octave. |
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7 |
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8 Octave is free software; you can redistribute it and/or modify it |
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9 under the terms of the GNU General Public License as published by the |
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10 Free Software Foundation; either version 2, or (at your option) any |
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11 later version. |
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12 |
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13 Octave is distributed in the hope that it will be useful, but WITHOUT |
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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16 for more details. |
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17 |
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18 You should have received a copy of the GNU General Public License |
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19 along with Octave; see the file COPYING. If not, write to the Free |
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20 Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
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21 |
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22 */ |
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23 |
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240
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24 #ifdef HAVE_CONFIG_H |
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25 #include "config.h" |
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26 #endif |
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27 |
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28 #include "Matrix.h" |
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29 |
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30 #include "tree-const.h" |
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31 #include "user-prefs.h" |
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32 #include "gripes.h" |
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33 #include "error.h" |
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34 #include "f-svd.h" |
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35 |
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36 #ifdef WITH_DLD |
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37 tree_constant * |
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162
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38 builtin_svd_2 (const tree_constant *args, int nargin, int nargout) |
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39 { |
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40 return svd (args, nargin, nargout); |
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41 } |
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42 #endif |
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43 |
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44 tree_constant * |
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45 svd (const tree_constant *args, int nargin, int nargout) |
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46 { |
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47 tree_constant *retval = NULL_TREE_CONST; |
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48 |
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49 tree_constant arg = args[1].make_numeric (); |
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50 |
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51 if (arg.rows () == 0 || arg.columns () == 0) |
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52 { |
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53 int flag = user_pref.propagate_empty_matrices; |
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54 if (flag != 0) |
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55 { |
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56 if (flag < 0) |
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57 gripe_empty_arg ("svd", 0); |
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58 Matrix m; |
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59 retval = new tree_constant [4]; |
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60 retval[0] = tree_constant (m); |
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61 retval[1] = tree_constant (m); |
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62 retval[2] = tree_constant (m); |
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63 } |
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64 else |
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65 gripe_empty_arg ("svd", 1); |
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66 |
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67 return retval; |
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68 } |
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69 |
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70 Matrix tmp; |
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71 ComplexMatrix ctmp; |
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72 switch (arg.const_type ()) |
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73 { |
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74 case tree_constant_rep::scalar_constant: |
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75 tmp.resize (1, 1); |
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76 tmp.elem (0, 0) = arg.double_value (); |
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77 break; |
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78 case tree_constant_rep::matrix_constant: |
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79 tmp = arg.matrix_value (); |
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80 break; |
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81 case tree_constant_rep::complex_scalar_constant: |
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82 ctmp.resize (1, 1); |
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83 ctmp.elem (0, 0) = arg.complex_value (); |
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84 break; |
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85 case tree_constant_rep::complex_matrix_constant: |
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86 ctmp = arg.complex_matrix_value (); |
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87 break; |
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88 default: |
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89 panic_impossible (); |
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90 break; |
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91 } |
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92 |
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93 switch (arg.const_type ()) |
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94 { |
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95 case tree_constant_rep::scalar_constant: |
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96 case tree_constant_rep::matrix_constant: |
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97 { |
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98 SVD result (tmp); |
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99 |
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100 DiagMatrix sigma = result.singular_values (); |
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101 |
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102 if (nargout == 1) |
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103 { |
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104 retval = new tree_constant [2]; |
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105 retval[0] = tree_constant (sigma.diag (), 1); |
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106 } |
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107 else |
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108 { |
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109 retval = new tree_constant [4]; |
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110 retval[0] = tree_constant (result.left_singular_matrix ()); |
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111 retval[1] = tree_constant (sigma); |
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112 retval[2] = tree_constant (result.right_singular_matrix ()); |
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113 } |
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114 } |
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115 break; |
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116 case tree_constant_rep::complex_scalar_constant: |
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117 case tree_constant_rep::complex_matrix_constant: |
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118 { |
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119 ComplexSVD result (ctmp); |
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120 |
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121 DiagMatrix sigma = result.singular_values (); |
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122 |
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123 if (nargout == 1) |
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124 { |
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125 retval = new tree_constant [2]; |
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126 retval[0] = tree_constant (sigma.diag (), 1); |
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127 } |
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128 else |
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129 { |
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130 retval = new tree_constant [4]; |
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131 retval[0] = tree_constant (result.left_singular_matrix ()); |
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132 retval[1] = tree_constant (sigma); |
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133 retval[2] = tree_constant (result.right_singular_matrix ()); |
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134 } |
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135 } |
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136 break; |
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137 default: |
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138 panic_impossible (); |
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139 break; |
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140 } |
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141 |
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142 return retval; |
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143 } |
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144 |
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145 /* |
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146 ;;; Local Variables: *** |
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147 ;;; mode: C++ *** |
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148 ;;; page-delimiter: "^/\\*" *** |
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149 ;;; End: *** |
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150 */ |
