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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 "EIG.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 (dgeev) (const char*, const char*, const int*, double*, |
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36 const int*, double*, double*, double*, |
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37 const int*, double*, const int*, double*, |
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38 const int*, int*, long, long); |
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39 |
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40 int F77_FCN (zgeev) (const char*, const char*, const int*, Complex*, |
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41 const int*, Complex*, Complex*, const int*, |
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42 Complex*, const int*, Complex*, const int*, |
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43 double*, int*, long, long); |
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44 } |
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45 |
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46 int |
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47 EIG::init (const Matrix& a) |
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48 { |
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49 int a_nr = a.rows (); |
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50 if (a_nr != a.cols ()) |
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51 { |
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52 (*current_liboctave_error_handler) ("EIG requires square matrix"); |
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53 return -1; |
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54 } |
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55 |
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56 int n = a_nr; |
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57 |
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58 int info; |
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59 |
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60 char jobvl = 'N'; |
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61 char jobvr = 'V'; |
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62 |
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63 double *tmp_data = dup (a.data (), a.length ()); |
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64 double *wr = new double[n]; |
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65 double *wi = new double[n]; |
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66 Matrix vr (n, n); |
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67 double *pvr = vr.fortran_vec (); |
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68 int lwork = 8*n; |
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69 double *work = new double[lwork]; |
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70 |
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71 double dummy; |
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72 int idummy = 1; |
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73 |
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74 F77_FCN (dgeev) (&jobvl, &jobvr, &n, tmp_data, &n, wr, wi, &dummy, |
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75 &idummy, pvr, &n, work, &lwork, &info, 1L, 1L); |
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76 |
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77 lambda.resize (n); |
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78 v.resize (n, n); |
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79 |
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80 for (int j = 0; j < n; j++) |
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81 { |
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82 if (wi[j] == 0.0) |
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83 { |
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84 lambda.elem (j) = Complex (wr[j]); |
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85 for (int i = 0; i < n; i++) |
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86 v.elem (i, j) = vr.elem (i, j); |
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87 } |
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88 else |
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89 { |
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90 if (j+1 >= n) |
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91 { |
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92 (*current_liboctave_error_handler) ("EIG: internal error"); |
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93 return -1; |
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94 } |
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95 |
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96 for (int i = 0; i < n; i++) |
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97 { |
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98 lambda.elem (j) = Complex (wr[j], wi[j]); |
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99 lambda.elem (j+1) = Complex (wr[j+1], wi[j+1]); |
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100 double real_part = vr.elem (i, j); |
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101 double imag_part = vr.elem (i, j+1); |
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102 v.elem (i, j) = Complex (real_part, imag_part); |
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103 v.elem (i, j+1) = Complex (real_part, -imag_part); |
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104 } |
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105 j++; |
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106 } |
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107 } |
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108 |
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109 delete [] tmp_data; |
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110 delete [] wr; |
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111 delete [] wi; |
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112 delete [] work; |
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113 |
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114 return info; |
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115 } |
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116 |
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117 int |
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118 EIG::init (const ComplexMatrix& a) |
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119 { |
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120 int a_nr = a.rows (); |
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121 if (a_nr != a.cols ()) |
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122 { |
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123 (*current_liboctave_error_handler) ("EIG requires square matrix"); |
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124 return -1; |
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125 } |
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126 |
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127 int n = a_nr; |
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128 |
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129 int info; |
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130 |
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131 char jobvl = 'N'; |
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132 char jobvr = 'V'; |
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133 |
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134 lambda.resize (n); |
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135 v.resize (n, n); |
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136 |
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137 Complex *pw = lambda.fortran_vec (); |
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138 Complex *pvr = v.fortran_vec (); |
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139 |
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140 Complex *tmp_data = dup (a.data (), a.length ()); |
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141 |
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142 int lwork = 8*n; |
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143 Complex *work = new Complex[lwork]; |
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144 double *rwork = new double[4*n]; |
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145 |
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146 Complex dummy; |
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147 int idummy = 1; |
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148 |
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149 F77_FCN (zgeev) (&jobvl, &jobvr, &n, tmp_data, &n, pw, &dummy, |
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150 &idummy, pvr, &n, work, &lwork, rwork, &info, 1L, |
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151 1L); |
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152 |
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153 delete [] tmp_data; |
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154 delete [] work; |
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155 delete [] rwork; |
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156 |
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157 return info; |
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158 } |
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159 |
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160 /* |
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161 ;;; Local Variables: *** |
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162 ;;; mode: C++ *** |
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163 ;;; page-delimiter: "^/\\*" *** |
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164 ;;; End: *** |
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165 */ |
