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1 /* |
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2 |
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3 Copyright (C) 1996, 1997 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 "dbleHESS.h" |
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28 #include "f77-fcn.h" |
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29 #include "lo-error.h" |
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30 |
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31 extern "C" |
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32 { |
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33 F77_RET_T |
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34 F77_FUNC (dgebal, DGEBAL) (F77_CONST_CHAR_ARG_DECL, |
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35 const octave_idx_type&, double*, const octave_idx_type&, octave_idx_type&, |
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36 octave_idx_type&, double*, octave_idx_type& |
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37 F77_CHAR_ARG_LEN_DECL); |
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38 |
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39 F77_RET_T |
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40 F77_FUNC (dgehrd, DGEHRD) (const octave_idx_type&, const octave_idx_type&, const octave_idx_type&, |
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41 double*, const octave_idx_type&, double*, double*, |
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42 const octave_idx_type&, octave_idx_type&); |
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43 |
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44 F77_RET_T |
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45 F77_FUNC (dorghr, DORGHR) (const octave_idx_type&, const octave_idx_type&, const octave_idx_type&, |
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46 double*, const octave_idx_type&, double*, double*, |
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47 const octave_idx_type&, octave_idx_type&); |
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48 |
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49 F77_RET_T |
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50 F77_FUNC (dgebak, DGEBAK) (F77_CONST_CHAR_ARG_DECL, |
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51 F77_CONST_CHAR_ARG_DECL, |
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52 const octave_idx_type&, const octave_idx_type&, const octave_idx_type&, double*, |
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53 const octave_idx_type&, double*, const octave_idx_type&, octave_idx_type& |
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54 F77_CHAR_ARG_LEN_DECL |
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55 F77_CHAR_ARG_LEN_DECL); |
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56 } |
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57 |
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58 octave_idx_type |
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59 HESS::init (const Matrix& a) |
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60 { |
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61 octave_idx_type a_nr = a.rows (); |
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62 octave_idx_type a_nc = a.cols (); |
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63 |
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64 if (a_nr != a_nc) |
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65 { |
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66 (*current_liboctave_error_handler) ("HESS requires square matrix"); |
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67 return -1; |
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68 } |
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69 |
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70 char job = 'N'; |
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71 char side = 'R'; |
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72 |
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73 octave_idx_type n = a_nc; |
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74 octave_idx_type lwork = 32 * n; |
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75 octave_idx_type info; |
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76 octave_idx_type ilo; |
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77 octave_idx_type ihi; |
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78 |
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79 hess_mat = a; |
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80 double *h = hess_mat.fortran_vec (); |
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81 |
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82 Array<double> scale (n); |
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83 double *pscale = scale.fortran_vec (); |
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84 |
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85 F77_XFCN (dgebal, DGEBAL, (F77_CONST_CHAR_ARG2 (&job, 1), |
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86 n, h, n, ilo, ihi, pscale, info |
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87 F77_CHAR_ARG_LEN (1))); |
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88 |
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89 if (f77_exception_encountered) |
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90 (*current_liboctave_error_handler) ("unrecoverable error in dgebal"); |
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91 else |
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92 { |
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93 Array<double> tau (n-1); |
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94 double *ptau = tau.fortran_vec (); |
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95 |
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96 Array<double> work (lwork); |
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97 double *pwork = work.fortran_vec (); |
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98 |
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99 F77_XFCN (dgehrd, DGEHRD, (n, ilo, ihi, h, n, ptau, pwork, |
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100 lwork, info)); |
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101 |
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102 if (f77_exception_encountered) |
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103 (*current_liboctave_error_handler) ("unrecoverable error in dgehrd"); |
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104 else |
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105 { |
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106 unitary_hess_mat = hess_mat; |
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107 double *z = unitary_hess_mat.fortran_vec (); |
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108 |
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109 F77_XFCN (dorghr, DORGHR, (n, ilo, ihi, z, n, ptau, pwork, |
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110 lwork, info)); |
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111 |
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112 if (f77_exception_encountered) |
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113 (*current_liboctave_error_handler) |
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114 ("unrecoverable error in dorghr"); |
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115 else |
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116 { |
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117 F77_XFCN (dgebak, DGEBAK, (F77_CONST_CHAR_ARG2 (&job, 1), |
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118 F77_CONST_CHAR_ARG2 (&side, 1), |
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119 n, ilo, ihi, pscale, n, z, |
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120 n, info |
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121 F77_CHAR_ARG_LEN (1) |
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122 F77_CHAR_ARG_LEN (1))); |
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123 |
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124 if (f77_exception_encountered) |
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125 (*current_liboctave_error_handler) |
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126 ("unrecoverable error in dgebak"); |
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127 else |
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128 { |
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129 // If someone thinks of a more graceful way of doing |
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130 // this (or faster for that matter :-)), please let |
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131 // me know! |
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132 |
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133 if (n > 2) |
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134 for (octave_idx_type j = 0; j < a_nc; j++) |
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135 for (octave_idx_type i = j+2; i < a_nr; i++) |
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136 hess_mat.elem (i, j) = 0; |
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137 } |
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138 } |
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139 } |
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140 } |
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141 |
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142 return info; |
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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 ;;; End: *** |
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149 */ |
