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1 // -*- C++ -*- |
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2 /* |
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3 |
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4 Copyright (C) 1996 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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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21 |
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22 */ |
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23 |
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24 #if defined (__GNUG__) |
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25 #pragma implementation |
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26 #endif |
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27 |
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28 #ifdef HAVE_CONFIG_H |
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29 #include <config.h> |
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30 #endif |
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31 |
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32 #include <cassert> |
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33 |
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34 #include "CmplxQRP.h" |
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35 #include "f77-fcn.h" |
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36 #include "lo-error.h" |
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37 #include "mx-inlines.cc" |
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38 |
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39 extern "C" |
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40 { |
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41 int F77_FCN (zgeqpf, ZGEQPF) (const int&, const int&, Complex*, |
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42 const int&, int*, Complex*, Complex*, |
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43 double*, int&); |
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44 |
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45 int F77_FCN (zungqr, ZUNGQR) (const int&, const int&, const int&, |
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46 Complex*, const int&, Complex*, |
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47 Complex*, const int&, int&); |
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48 } |
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49 |
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50 // It would be best to share some of this code with ComplexQR class... |
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51 |
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52 ComplexQRP::ComplexQRP (const ComplexMatrix& a, QR::type qr_type) |
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53 { |
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54 assert (qr_type != QR::raw); |
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55 |
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56 int m = a.rows (); |
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57 int n = a.cols (); |
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58 |
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59 if (m == 0 || n == 0) |
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60 { |
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61 (*current_liboctave_error_handler) |
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62 ("ComplexQR must have non-empty matrix"); |
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63 return; |
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64 } |
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65 |
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66 int min_mn = m < n ? m : n; |
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67 Array<Complex> tau (min_mn); |
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68 Complex *ptau = tau.fortran_vec (); |
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69 |
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70 int lwork = n; |
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71 Array<Complex> work (lwork); |
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72 Complex *pwork = work.fortran_vec (); |
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73 |
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74 int info = 0; |
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75 |
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76 ComplexMatrix A_fact; |
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77 if (m > n) |
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78 { |
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79 A_fact.resize (m, m); |
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80 A_fact.insert (a, 0, 0); |
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81 } |
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82 else |
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83 A_fact = a; |
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84 |
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85 Complex *tmp_data = A_fact.fortran_vec (); |
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86 |
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87 Array<double> rwork (2*n); |
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88 double *prwork = rwork.fortran_vec (); |
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89 |
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90 Array<int> jpvt (n, 0); |
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91 int *pjpvt = jpvt.fortran_vec (); |
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92 |
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93 // Code to enforce a certain permutation could go here... |
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94 |
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95 F77_XFCN (zgeqpf, ZGEQPF, (m, n, tmp_data, m, pjpvt, ptau, pwork, |
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96 prwork, info)); |
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97 |
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98 if (f77_exception_encountered) |
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99 (*current_liboctave_error_handler) ("unrecoverable error in zgeqpf"); |
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100 else |
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101 { |
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102 // Form Permutation matrix (if economy is requested, return the |
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103 // indices only!) |
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104 |
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105 if (qr_type == QR::economy && m > n) |
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106 { |
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107 p.resize (1, n, 0.0); |
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108 for (int j = 0; j < n; j++) |
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109 p.elem (0, j) = jpvt.elem (j); |
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110 } |
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111 else |
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112 { |
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113 p.resize (n, n, 0.0); |
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114 for (int j = 0; j < n; j++) |
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115 p.elem (jpvt.elem (j) - 1, j) = 1.0; |
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116 } |
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117 |
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118 volatile int n2; |
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119 |
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120 if (qr_type == QR::economy && m > n) |
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121 { |
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122 n2 = n; |
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123 r.resize (n, n, 0.0); |
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124 } |
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125 else |
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126 { |
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127 n2 = m; |
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128 r.resize (m, n, 0.0); |
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129 } |
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130 |
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131 for (int j = 0; j < n; j++) |
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132 { |
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133 int limit = j < min_mn-1 ? j : min_mn-1; |
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134 for (int i = 0; i <= limit; i++) |
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135 r.elem (i, j) = A_fact.elem (i, j); |
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136 } |
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137 |
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138 lwork = 32*m; |
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139 work.resize (lwork); |
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140 Complex *pwork = work.fortran_vec (); |
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141 |
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142 F77_XFCN (zungqr, ZUNGQR, (m, m, min_mn, tmp_data, m, ptau, |
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143 pwork, lwork, info)); |
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144 |
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145 if (f77_exception_encountered) |
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146 (*current_liboctave_error_handler) ("unrecoverable error in zungqr"); |
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147 else |
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148 { |
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149 q = ComplexMatrix (tmp_data, m, m); |
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150 q.resize (m, n2); |
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151 } |
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152 } |
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153 } |
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154 |
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155 /* |
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156 ;;; Local Variables: *** |
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157 ;;; mode: C++ *** |
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158 ;;; page-delimiter: "^/\\*" *** |
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159 ;;; End: *** |
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160 */ |
