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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 "EIG.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 (dgeev, DGEEV) (const char*, const char*, const int&, |
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40 double*, const int&, double*, double*, |
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41 double*, const int&, double*, |
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42 const int&, double*, const int&, int&, |
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43 long, long); |
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44 |
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45 int F77_FCN (zgeev, ZGEEV) (const char*, const char*, const int&, |
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46 Complex*, const int&, Complex*, |
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47 Complex*, const int&, Complex*, |
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48 const int&, Complex*, const int&, |
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49 double*, int&, long, long); |
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50 } |
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51 |
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52 int |
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53 EIG::init (const Matrix& a) |
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54 { |
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55 int n = a.rows (); |
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56 |
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57 if (n != a.cols ()) |
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58 { |
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59 (*current_liboctave_error_handler) ("EIG requires square matrix"); |
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60 return -1; |
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61 } |
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62 |
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63 int info; |
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64 |
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65 Matrix atmp = a; |
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66 double *tmp_data = atmp.fortran_vec (); |
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67 |
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68 Array<double> wr (n); |
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69 double *pwr = wr.fortran_vec (); |
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70 |
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71 Array<double> wi (n); |
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72 double *pwi = wi.fortran_vec (); |
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73 |
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74 Matrix vr (n, n); |
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75 double *pvr = vr.fortran_vec (); |
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76 |
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77 int lwork = 8*n; |
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78 |
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79 Array<double> work (lwork); |
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80 double *pwork = work.fortran_vec (); |
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81 |
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82 double *dummy = 0; |
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83 int idummy = 1; |
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84 |
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85 F77_XFCN (dgeev, DGEEV, ("N", "V", n, tmp_data, n, pwr, pwi, dummy, |
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86 idummy, pvr, n, pwork, lwork, info, 1L, 1L)); |
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87 |
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88 if (f77_exception_encountered) |
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89 (*current_liboctave_error_handler) ("unrecoverable error in dgeev"); |
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90 else |
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91 { |
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92 lambda.resize (n); |
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93 v.resize (n, n); |
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94 |
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95 for (int j = 0; j < n; j++) |
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96 { |
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97 if (wi.elem (j) == 0.0) |
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98 { |
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99 lambda.elem (j) = Complex (wr.elem (j)); |
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100 for (int i = 0; i < n; i++) |
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101 v.elem (i, j) = vr.elem (i, j); |
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102 } |
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103 else |
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104 { |
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105 if (j+1 >= n) |
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106 { |
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107 (*current_liboctave_error_handler) ("EIG: internal error"); |
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108 return -1; |
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109 } |
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110 |
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111 for (int i = 0; i < n; i++) |
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112 { |
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113 lambda.elem (j) = Complex (wr.elem (j), wi.elem (j)); |
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114 lambda.elem (j+1) = Complex (wr.elem (j+1), wi.elem (j+1)); |
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115 double real_part = vr.elem (i, j); |
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116 double imag_part = vr.elem (i, j+1); |
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117 v.elem (i, j) = Complex (real_part, imag_part); |
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118 v.elem (i, j+1) = Complex (real_part, -imag_part); |
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119 } |
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120 j++; |
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121 } |
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122 } |
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123 } |
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124 |
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125 return info; |
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126 } |
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127 |
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128 int |
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129 EIG::init (const ComplexMatrix& a) |
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130 { |
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131 int n = a.rows (); |
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132 |
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133 if (n != a.cols ()) |
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134 { |
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135 (*current_liboctave_error_handler) ("EIG requires square matrix"); |
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136 return -1; |
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137 } |
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138 |
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139 int info; |
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140 |
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141 lambda.resize (n); |
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142 v.resize (n, n); |
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143 |
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144 Complex *pw = lambda.fortran_vec (); |
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145 Complex *pvr = v.fortran_vec (); |
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146 |
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147 ComplexMatrix atmp = a; |
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148 Complex *tmp_data = atmp.fortran_vec (); |
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149 |
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150 int lwork = 8*n; |
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151 |
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152 Array<Complex> work (lwork); |
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153 Complex *pwork = work.fortran_vec (); |
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154 |
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155 Array<double> rwork (4*n); |
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156 double *prwork = rwork.fortran_vec (); |
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157 |
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158 Complex *dummy = 0; |
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159 int idummy = 1; |
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160 |
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161 F77_XFCN (zgeev, ZGEEV, ("N", "V", n, tmp_data, n, pw, dummy, idummy, |
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162 pvr, n, pwork, lwork, prwork, info, 1L, 1L)); |
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163 |
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164 if (f77_exception_encountered) |
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165 (*current_liboctave_error_handler) ("unrecoverable error in zgeev"); |
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166 |
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167 return info; |
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168 } |
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169 |
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170 /* |
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171 ;;; Local Variables: *** |
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172 ;;; mode: C++ *** |
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173 ;;; page-delimiter: "^/\\*" *** |
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174 ;;; End: *** |
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175 */ |
