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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, 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 "dbleSCHUR.h" |
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33 #include "f77-uscore.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 (dgeesx, DGEESX) (const char*, const char*, |
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40 int (*)(const double&, const double&), |
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41 const char*, const int&, double*, |
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42 const int&, int&, double*, double*, |
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43 double*, const int&, double&, double&, |
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44 double*, const int&, int*, const int&, |
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45 int*, int&, long, long); |
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46 } |
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47 |
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48 static int |
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49 select_ana (const double& a, const double& b) |
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50 { |
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51 return (a < 0.0); |
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52 } |
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53 |
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54 static int |
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55 select_dig (const double& a, const double& b) |
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56 { |
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57 return (hypot (a, b) < 1.0); |
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58 } |
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59 |
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60 int |
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61 SCHUR::init (const Matrix& a, const char *ord) |
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62 { |
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63 int a_nr = a.rows (); |
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64 int a_nc = a.cols (); |
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65 if (a_nr != a_nc) |
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66 { |
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67 (*current_liboctave_error_handler) ("SCHUR 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 *jobvs = "V"; |
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72 char *sort; |
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73 |
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74 if (*ord == 'A' || *ord == 'D' || *ord == 'a' || *ord == 'd') |
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75 sort = "S"; |
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76 else |
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77 sort = "N"; |
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78 |
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79 char *sense = "N"; |
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80 |
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81 int n = a_nc; |
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82 int lwork = 8 * n; |
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83 int liwork = 1; |
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84 int info; |
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85 int sdim; |
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86 double rconde; |
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87 double rcondv; |
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88 |
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89 double *s = dup (a.data (), a.length ()); |
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90 |
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91 double *wr = new double [n]; |
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92 double *wi = new double [n]; |
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93 double *q = new double [n*n]; |
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94 double *work = new double [lwork]; |
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95 |
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96 // These are not referenced for the non-ordered Schur routine. |
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97 |
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98 int *iwork = 0; |
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99 int *bwork = 0; |
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100 if (*ord == 'A' || *ord == 'D' || *ord == 'a' || *ord == 'd') |
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101 { |
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102 iwork = new int [liwork]; |
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103 bwork = new int [n]; |
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104 } |
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105 |
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106 if (*ord == 'A' || *ord == 'a') |
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107 { |
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108 F77_FCN (dgeesx, DGEESX) (jobvs, sort, select_ana, sense, n, s, |
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109 n, sdim, wr, wi, q, n, rconde, rcondv, |
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110 work, lwork, iwork, liwork, bwork, |
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111 info, 1L, 1L); |
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112 } |
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113 else if (*ord == 'D' || *ord == 'd') |
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114 { |
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115 F77_FCN (dgeesx, DGEESX) (jobvs, sort, select_dig, sense, n, s, |
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116 n, sdim, wr, wi, q, n, rconde, rcondv, |
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117 work, lwork, iwork, liwork, bwork, |
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118 info, 1L, 1L); |
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119 |
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120 } |
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121 else |
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122 { |
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123 F77_FCN (dgeesx, DGEESX) (jobvs, sort, (void *) 0, sense, n, s, |
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124 n, sdim, wr, wi, q, n, rconde, rcondv, |
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125 work, lwork, iwork, liwork, bwork, |
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126 info, 1L, 1L); |
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127 } |
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128 |
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129 schur_mat = Matrix (s, n, n); |
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130 unitary_mat = Matrix (q, n, n); |
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131 |
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132 delete [] wr; |
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133 delete [] wi; |
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134 delete [] work; |
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135 delete [] iwork; |
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136 delete [] bwork; |
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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 ostream& |
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142 operator << (ostream& os, const SCHUR& a) |
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143 { |
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144 os << a.schur_matrix () << "\n"; |
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145 os << a.unitary_matrix () << "\n"; |
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146 |
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147 return os; |
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148 } |
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149 |
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150 /* |
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151 ;;; Local Variables: *** |
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152 ;;; mode: C++ *** |
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153 ;;; page-delimiter: "^/\\*" *** |
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154 ;;; End: *** |
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155 */ |
