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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 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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23 #if defined (__GNUG__) && ! defined (NO_PRAGMA_INTERFACE_IMPLEMENTATION) |
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24 #pragma implementation |
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25 #endif |
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26 |
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27 #ifdef HAVE_CONFIG_H |
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28 #include <config.h> |
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29 #endif |
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30 |
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31 #include "dbleHESS.h" |
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32 #include "f77-fcn.h" |
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33 #include "lo-error.h" |
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34 |
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35 extern "C" |
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36 { |
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37 int F77_FUNC (dgebal, DGEBAL) (const char*, const int&, double*, |
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38 const int&, int&, int&, double*, |
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39 int&, long, long); |
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40 |
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41 int F77_FUNC (dgehrd, DGEHRD) (const int&, const int&, const int&, |
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42 double*, const int&, double*, double*, |
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43 const int&, int&, long, long); |
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44 |
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45 int F77_FUNC (dorghr, DORGHR) (const int&, const int&, const int&, |
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46 double*, const int&, double*, double*, |
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47 const int&, int&, long, long); |
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48 |
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49 int F77_FUNC (dgebak, DGEBAK) (const char*, const char*, const int&, |
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50 const int&, const int&, double*, |
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51 const int&, double*, const int&, int&, |
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52 long, long); |
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53 } |
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54 |
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55 int |
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56 HESS::init (const Matrix& a) |
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57 { |
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58 int a_nr = a.rows (); |
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59 int a_nc = a.cols (); |
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60 |
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61 if (a_nr != a_nc) |
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62 { |
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63 (*current_liboctave_error_handler) ("HESS requires square matrix"); |
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64 return -1; |
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65 } |
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66 |
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67 char job = 'N'; |
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68 char side = 'R'; |
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69 |
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70 int n = a_nc; |
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71 int lwork = 32 * n; |
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72 int info; |
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73 int ilo; |
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74 int ihi; |
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75 |
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76 hess_mat = a; |
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77 double *h = hess_mat.fortran_vec (); |
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78 |
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79 Array<double> scale (n); |
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80 double *pscale = scale.fortran_vec (); |
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81 |
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82 F77_XFCN (dgebal, DGEBAL, (&job, n, h, n, ilo, ihi, pscale, info, |
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83 1L, 1L)); |
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84 |
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85 if (f77_exception_encountered) |
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86 (*current_liboctave_error_handler) ("unrecoverable error in dgebal"); |
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87 else |
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88 { |
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89 Array<double> tau (n-1); |
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90 double *ptau = tau.fortran_vec (); |
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91 |
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92 Array<double> work (lwork); |
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93 double *pwork = work.fortran_vec (); |
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94 |
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95 F77_XFCN (dgehrd, DGEHRD, (n, ilo, ihi, h, n, ptau, pwork, |
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96 lwork, info, 1L, 1L)); |
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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 dgehrd"); |
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100 else |
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101 { |
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102 unitary_hess_mat = hess_mat; |
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103 double *z = unitary_hess_mat.fortran_vec (); |
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104 |
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105 F77_XFCN (dorghr, DORGHR, (n, ilo, ihi, z, n, ptau, pwork, |
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106 lwork, info, 1L, 1L)); |
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107 |
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108 if (f77_exception_encountered) |
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109 (*current_liboctave_error_handler) |
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110 ("unrecoverable error in dorghr"); |
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111 else |
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112 { |
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113 F77_XFCN (dgebak, DGEBAK, (&job, &side, n, ilo, ihi, |
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114 pscale, n, z, n, info, 1L, 1L)); |
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115 |
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116 if (f77_exception_encountered) |
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117 (*current_liboctave_error_handler) |
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118 ("unrecoverable error in dgebak"); |
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119 else |
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120 { |
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121 // If someone thinks of a more graceful way of doing |
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122 // this (or faster for that matter :-)), please let |
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123 // me know! |
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124 |
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125 if (n > 2) |
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126 for (int j = 0; j < a_nc; j++) |
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127 for (int i = j+2; i < a_nr; i++) |
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128 hess_mat.elem (i, j) = 0; |
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129 } |
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130 } |
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131 } |
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132 } |
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133 |
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134 return info; |
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135 } |
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136 |
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137 /* |
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138 ;;; Local Variables: *** |
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139 ;;; mode: C++ *** |
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140 ;;; End: *** |
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141 */ |
