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1 // -*- C++ -*- |
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2 /* |
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3 |
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4 Copyright (C) 1992, 1993, 1994, 1995 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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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 "dbleQR.h" |
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29 #include "mx-inlines.cc" |
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30 #include "lo-error.h" |
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31 #include "f77-uscore.h" |
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32 |
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33 extern "C" |
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34 { |
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35 int F77_FCN (dgeqrf) (const int*, const int*, double*, const int*, |
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36 double*, double*, const int*, int*); |
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37 |
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38 int F77_FCN (dorgqr) (const int*, const int*, const int*, double*, |
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39 const int*, double*, double*, const int*, int*); |
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40 |
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41 int F77_FCN (dgeqpf) (const int*, const int*, double*, const int*, |
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42 int*, double*, double*, int*); |
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43 } |
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44 |
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45 QR::QR (const Matrix& a, QR::type qr_type) |
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46 { |
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47 int m = a.rows (); |
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48 int n = a.cols (); |
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49 |
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50 if (m == 0 || n == 0) |
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51 { |
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52 (*current_liboctave_error_handler) ("QR must have non-empty matrix"); |
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53 return; |
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54 } |
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55 |
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56 double *tmp_data; |
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57 int min_mn = m < n ? m : n; |
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58 double *tau = new double[min_mn]; |
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59 int lwork = 32*n; |
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60 double *work = new double[lwork]; |
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61 int info = 0; |
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62 |
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63 if (m > n) |
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64 { |
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65 tmp_data = new double [m*m]; |
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66 copy (tmp_data, a.data (), a.length ()); |
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67 } |
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68 else |
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69 tmp_data = dup (a.data (), a.length ()); |
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70 |
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71 F77_FCN (dgeqrf) (&m, &n, tmp_data, &m, tau, work, &lwork, &info); |
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72 |
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73 delete [] work; |
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74 |
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75 if (qr_type == QR::raw) |
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76 { |
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77 for (int j = 0; j < min_mn; j++) |
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78 { |
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79 int limit = j < min_mn - 1 ? j : min_mn - 1; |
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80 for (int i = limit + 1; i < m; i++) |
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81 tmp_data[m*j+i] *= tau[j]; |
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82 } |
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83 } |
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84 else |
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85 { |
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86 int n2; |
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87 if (qr_type == QR::economy && m > n) |
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88 { |
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89 n2 = n; |
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90 r.resize (n, n, 0.0); |
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91 } |
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92 else |
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93 { |
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94 n2 = m; |
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95 r.resize (m, n, 0.0); |
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96 } |
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97 |
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98 for (int j = 0; j < n; j++) |
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99 { |
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100 int limit = j < min_mn-1 ? j : min_mn-1; |
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101 for (int i = 0; i <= limit; i++) |
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102 r.elem (i, j) = tmp_data[m*j+i]; |
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103 } |
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104 |
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105 lwork = 32*m; |
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106 work = new double[lwork]; |
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107 |
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108 F77_FCN (dorgqr) (&m, &m, &min_mn, tmp_data, &m, tau, work, |
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109 &lwork, &info); |
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110 |
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111 q = Matrix (tmp_data, m, m); |
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112 q.resize (m, n2); |
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113 |
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114 delete [] tau; |
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115 delete [] work; |
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116 } |
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117 } |
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118 |
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119 /* |
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120 ;;; Local Variables: *** |
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121 ;;; mode: C++ *** |
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122 ;;; page-delimiter: "^/\\*" *** |
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123 ;;; End: *** |
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124 */ |
