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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 "CmplxHESS.h" |
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33 #include "f77-fcn.h" |
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34 #include "lo-error.h" |
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35 #include "mx-inlines.cc" |
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36 |
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37 extern "C" |
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38 { |
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39 int F77_FCN (zgebal, ZGEBAL) (const char*, const int&, Complex*, |
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40 const int&, int&, int&, double*, int&, |
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41 long, long); |
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42 |
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43 int F77_FCN (zgehrd, ZGEHRD) (const int&, const int&, const int&, |
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44 Complex*, const int&, Complex*, |
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45 Complex*, const int&, int&, long, |
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46 long); |
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47 |
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48 int F77_FCN (zunghr, ZUNGHR) (const int&, const int&, const int&, |
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49 Complex*, const int&, Complex*, |
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50 Complex*, const int&, int&, long, long); |
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51 |
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52 int F77_FCN (zgebak, ZGEBAK) (const char*, const char*, const int&, |
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53 const int&, const int&, double*, |
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54 const int&, Complex*, const int&, |
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55 int&, long, long); |
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56 } |
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57 |
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58 int |
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59 ComplexHESS::init (const ComplexMatrix& a) |
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60 { |
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61 int a_nr = a.rows (); |
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62 int 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) |
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67 ("ComplexHESS requires square matrix"); |
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68 return -1; |
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69 } |
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70 |
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71 char job = 'N'; |
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72 char side = 'R'; |
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73 |
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74 int n = a_nc; |
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75 int lwork = 32 * n; |
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76 int info; |
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77 int ilo; |
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78 int ihi; |
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79 |
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80 hess_mat = a; |
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81 Complex *h = hess_mat.fortran_vec (); |
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82 |
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83 Array<double> scale (n); |
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84 double *pscale = scale.fortran_vec (); |
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85 |
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86 F77_XFCN (zgebal, ZGEBAL, (&job, n, h, n, ilo, ihi, pscale, info, |
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87 1L, 1L)); |
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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 zgebal"); |
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91 else |
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92 { |
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93 Array<Complex> tau (n-1); |
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94 Complex *ptau = tau.fortran_vec (); |
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95 |
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96 Array<Complex> work (lwork); |
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97 Complex *pwork = work.fortran_vec (); |
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98 |
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99 F77_XFCN (zgehrd, ZGEHRD, (n, ilo, ihi, h, n, ptau, pwork, lwork, |
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100 info, 1L, 1L)); |
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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 zgehrd"); |
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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 Complex *z = unitary_hess_mat.fortran_vec (); |
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108 |
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109 F77_XFCN (zunghr, ZUNGHR, (n, ilo, ihi, z, n, ptau, pwork, |
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110 lwork, info, 1L, 1L)); |
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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 zunghr"); |
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115 else |
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116 { |
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117 F77_XFCN (zgebak, ZGEBAK, (&job, &side, n, ilo, ihi, |
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118 pscale, n, z, n, info, 1L, 1L)); |
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119 |
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120 if (f77_exception_encountered) |
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121 (*current_liboctave_error_handler) |
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122 ("unrecoverable error in zgebak"); |
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123 else |
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124 { |
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125 // If someone thinks of a more graceful way of |
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126 // doing this (or faster for that matter :-)), |
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127 // please let me know! |
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128 |
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129 if (n > 2) |
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130 for (int j = 0; j < a_nc; j++) |
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131 for (int i = j+2; i < a_nr; i++) |
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132 hess_mat.elem (i, j) = 0; |
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133 } |
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134 } |
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135 } |
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136 } |
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137 |
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138 return info; |
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139 } |
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140 |
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141 /* |
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142 ;;; Local Variables: *** |
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143 ;;; mode: C++ *** |
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144 ;;; page-delimiter: "^/\\*" *** |
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145 ;;; End: *** |
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146 */ |
