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1 /* |
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2 |
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1884
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3 Copyright (C) 1996 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 2, or (at your option) any |
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10 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, write to the Free |
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19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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20 |
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21 */ |
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22 |
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240
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23 #ifdef HAVE_CONFIG_H |
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1192
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24 #include <config.h> |
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25 #endif |
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26 |
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1343
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27 #include <cassert> |
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28 |
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1352
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29 #include "CMatrix.h" |
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453
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30 #include "dMatrix.h" |
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1651
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31 #include "oct-cmplx.h" |
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32 |
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33 #include "error.h" |
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34 #include "xdiv.h" |
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35 |
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36 static inline int |
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37 result_ok (int info, double rcond, int warn = 1) |
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38 { |
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39 assert (info != -1); |
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40 |
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41 if (info == -2) |
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42 { |
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931
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43 if (warn) |
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44 warning ("matrix singular to machine precision, rcond = %g", rcond); |
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931
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45 else |
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932
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46 error ("matrix singular to machine precision, rcond = %g", rcond); |
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47 |
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48 return 0; |
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49 } |
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50 else |
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51 return 1; |
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52 } |
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53 |
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54 static inline int |
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55 mx_leftdiv_conform (int a_nr, int b_nr) |
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56 { |
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57 if (a_nr != b_nr) |
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58 { |
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59 error ("number of rows must be the same for left division"); |
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60 return 0; |
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61 } |
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62 |
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63 return 1; |
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64 } |
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65 |
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66 static inline int |
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67 mx_div_conform (int b_nc, int a_nc) |
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68 { |
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69 if (a_nc != b_nc) |
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70 { |
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71 error ("number of columns must be the same for right division"); |
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72 return 0; |
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73 } |
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74 |
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75 return 1; |
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76 } |
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77 |
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767
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78 // Right division functions. |
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79 // |
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80 // op2 / op1: m cm |
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81 // +-- +---+----+ |
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82 // matrix | 1 | 3 | |
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83 // +---+----+ |
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84 // complex_matrix | 2 | 4 | |
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85 // +---+----+ |
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86 |
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767
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87 // -*- 1 -*- |
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1800
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88 Matrix |
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164
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89 xdiv (const Matrix& a, const Matrix& b) |
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90 { |
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91 if (! mx_div_conform (b.columns (), a.columns ())) |
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92 return Matrix (); |
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93 |
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94 Matrix atmp = a.transpose (); |
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95 Matrix btmp = b.transpose (); |
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96 |
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97 int info; |
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98 if (btmp.rows () == btmp.columns ()) |
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99 { |
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100 double rcond = 0.0; |
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101 Matrix result = btmp.solve (atmp, info, rcond); |
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102 if (result_ok (info, rcond)) |
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103 return Matrix (result.transpose ()); |
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104 } |
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105 |
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106 int rank; |
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107 Matrix result = btmp.lssolve (atmp, info, rank); |
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108 |
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109 return result.transpose (); |
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110 } |
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111 |
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767
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112 // -*- 2 -*- |
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1800
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113 ComplexMatrix |
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164
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114 xdiv (const Matrix& a, const ComplexMatrix& b) |
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115 { |
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116 if (! mx_div_conform (b.columns (), a.columns ())) |
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117 return ComplexMatrix (); |
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118 |
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119 Matrix atmp = a.transpose (); |
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120 ComplexMatrix btmp = b.hermitian (); |
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121 |
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122 int info; |
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123 if (btmp.rows () == btmp.columns ()) |
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124 { |
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125 double rcond = 0.0; |
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126 ComplexMatrix result = btmp.solve (atmp, info, rcond); |
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127 if (result_ok (info, rcond)) |
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128 return result.hermitian (); |
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129 } |
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130 |
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131 int rank; |
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132 ComplexMatrix result = btmp.lssolve (atmp, info, rank); |
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133 |
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134 return result.hermitian (); |
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135 } |
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136 |
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767
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137 // -*- 3 -*- |
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138 ComplexMatrix |
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164
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139 xdiv (const ComplexMatrix& a, const Matrix& b) |
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140 { |
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141 if (! mx_div_conform (b.columns (), a.columns ())) |
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142 return ComplexMatrix (); |
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143 |
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144 ComplexMatrix atmp = a.hermitian (); |
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145 Matrix btmp = b.transpose (); |
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146 |
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147 int info; |
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148 if (btmp.rows () == btmp.columns ()) |
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149 { |
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150 double rcond = 0.0; |
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151 ComplexMatrix result = btmp.solve (atmp, info, rcond); |
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152 if (result_ok (info, rcond)) |
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153 return result.hermitian (); |
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154 } |
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155 |
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156 int rank; |
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157 ComplexMatrix result = btmp.lssolve (atmp, info, rank); |
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158 |
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159 return result.hermitian (); |
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160 } |
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161 |
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767
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162 // -*- 4 -*- |
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1800
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163 ComplexMatrix |
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164 xdiv (const ComplexMatrix& a, const ComplexMatrix& b) |
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165 { |
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166 if (! mx_div_conform (b.columns (), a.columns ())) |
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167 return ComplexMatrix (); |
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168 |
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169 ComplexMatrix atmp = a.hermitian (); |
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170 ComplexMatrix btmp = b.hermitian (); |
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171 |
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172 int info; |
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173 if (btmp.rows () == btmp.columns ()) |
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174 { |
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175 double rcond = 0.0; |
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176 ComplexMatrix result = btmp.solve (atmp, info, rcond); |
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177 if (result_ok (info, rcond)) |
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178 return result.hermitian (); |
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179 } |
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180 |
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181 int rank; |
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182 ComplexMatrix result = btmp.lssolve (atmp, info, rank); |
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183 |
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184 return result.hermitian (); |
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185 } |
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186 |
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187 // Funny element by element division operations. |
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188 // |
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189 // op2 \ op1: s cs |
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190 // +-- +---+----+ |
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191 // matrix | 1 | 3 | |
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192 // +---+----+ |
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193 // complex_matrix | 2 | 4 | |
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194 // +---+----+ |
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195 |
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196 Matrix |
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197 x_el_div (double a, const Matrix& b) |
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198 { |
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199 int nr = b.rows (); |
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200 int nc = b.columns (); |
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201 |
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202 Matrix result (nr, nc); |
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203 |
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204 for (int j = 0; j < nc; j++) |
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205 for (int i = 0; i < nr; i++) |
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206 result.elem (i, j) = a / b.elem (i, j); |
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207 |
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208 return result; |
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209 } |
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210 |
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211 ComplexMatrix |
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212 x_el_div (double a, const ComplexMatrix& b) |
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213 { |
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214 int nr = b.rows (); |
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215 int nc = b.columns (); |
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216 |
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217 ComplexMatrix result (nr, nc); |
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218 |
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219 for (int j = 0; j < nc; j++) |
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220 for (int i = 0; i < nr; i++) |
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221 result.elem (i, j) = a / b.elem (i, j); |
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222 |
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223 return result; |
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224 } |
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225 |
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226 ComplexMatrix |
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227 x_el_div (const Complex a, const Matrix& b) |
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228 { |
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229 int nr = b.rows (); |
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230 int nc = b.columns (); |
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231 |
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232 ComplexMatrix result (nr, nc); |
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233 |
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234 for (int j = 0; j < nc; j++) |
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235 for (int i = 0; i < nr; i++) |
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236 result.elem (i, j) = a / b.elem (i, j); |
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237 |
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238 return result; |
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239 } |
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240 |
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241 ComplexMatrix |
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242 x_el_div (const Complex a, const ComplexMatrix& b) |
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243 { |
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244 int nr = b.rows (); |
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245 int nc = b.columns (); |
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246 |
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247 ComplexMatrix result (nr, nc); |
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248 |
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249 for (int j = 0; j < nc; j++) |
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250 for (int i = 0; i < nr; i++) |
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251 result.elem (i, j) = a / b.elem (i, j); |
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252 |
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253 return result; |
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254 } |
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255 |
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256 // Left division functions. |
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257 // |
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258 // op2 \ op1: m cm |
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259 // +-- +---+----+ |
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260 // matrix | 1 | 3 | |
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261 // +---+----+ |
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262 // complex_matrix | 2 | 4 | |
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263 // +---+----+ |
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264 |
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265 // -*- 1 -*- |
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266 Matrix |
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267 xleftdiv (const Matrix& a, const Matrix& b) |
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268 { |
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269 if (! mx_leftdiv_conform (a.rows (), b.rows ())) |
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270 return Matrix (); |
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271 |
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272 int info; |
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273 if (a.rows () == a.columns ()) |
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274 { |
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275 double rcond = 0.0; |
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276 Matrix result = a.solve (b, info, rcond); |
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277 if (result_ok (info, rcond)) |
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278 return result; |
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279 } |
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280 |
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281 int rank; |
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282 return a.lssolve (b, info, rank); |
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283 } |
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284 |
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285 // -*- 2 -*- |
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286 ComplexMatrix |
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287 xleftdiv (const Matrix& a, const ComplexMatrix& b) |
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288 { |
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289 if (! mx_leftdiv_conform (a.rows (), b.rows ())) |
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290 return ComplexMatrix (); |
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291 |
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292 int info; |
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293 if (a.rows () == a.columns ()) |
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294 { |
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295 double rcond = 0.0; |
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296 ComplexMatrix result = a.solve (b, info, rcond); |
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297 if (result_ok (info, rcond)) |
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298 return result; |
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299 } |
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300 |
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301 int rank; |
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302 return a.lssolve (b, info, rank); |
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303 } |
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304 |
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305 // -*- 3 -*- |
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306 ComplexMatrix |
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307 xleftdiv (const ComplexMatrix& a, const Matrix& b) |
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308 { |
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309 if (! mx_leftdiv_conform (a.rows (), b.rows ())) |
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310 return ComplexMatrix (); |
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311 |
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312 int info; |
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313 if (a.rows () == a.columns ()) |
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314 { |
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315 double rcond = 0.0; |
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316 ComplexMatrix result = a.solve (b, info, rcond); |
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317 if (result_ok (info, rcond)) |
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318 return result; |
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319 } |
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320 |
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321 int rank; |
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322 return a.lssolve (b, info, rank); |
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323 } |
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324 |
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325 // -*- 4 -*- |
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326 ComplexMatrix |
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327 xleftdiv (const ComplexMatrix& a, const ComplexMatrix& b) |
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328 { |
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329 if (! mx_leftdiv_conform (a.rows (), b.rows ())) |
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330 return ComplexMatrix (); |
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331 |
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332 int info; |
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333 if (a.rows () == a.columns ()) |
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334 { |
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335 double rcond = 0.0; |
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336 ComplexMatrix result = a.solve (b, info, rcond); |
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337 if (result_ok (info, rcond)) |
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338 return result; |
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339 } |
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340 |
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341 int rank; |
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342 return a.lssolve (b, info, rank); |
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343 } |
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344 |
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345 /* |
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346 ;;; Local Variables: *** |
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347 ;;; mode: C++ *** |
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348 ;;; End: *** |
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349 */ |
