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1 /* |
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2 |
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3 Copyright (C) 1996 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__) |
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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 <iostream.h> |
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32 |
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33 #include "dbleSCHUR.h" |
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34 #include "f77-fcn.h" |
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35 #include "lo-error.h" |
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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 SCHUR::select_function, const char*, |
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41 const int&, double*, const int&, |
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42 int&, double*, double*, double*, |
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43 const int&, double&, double&, double*, |
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44 const int&, int*, const int&, int*, |
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45 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&) |
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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 string& 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 |
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66 if (a_nr != a_nc) |
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67 { |
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68 (*current_liboctave_error_handler) ("SCHUR requires square matrix"); |
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69 return -1; |
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70 } |
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71 |
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72 char jobvs = 'V'; |
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73 char sense = 'N'; |
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74 char sort = 'N'; |
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75 |
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76 char ord_char = ord.empty () ? 'U' : ord[0]; |
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77 |
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78 if (ord_char == 'A' || ord_char == 'D' || ord_char == 'a' || ord_char == 'd') |
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79 sort = 'S'; |
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80 |
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81 if (ord_char == 'A' || ord_char == 'a') |
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82 selector = select_ana; |
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83 else if (ord_char == 'D' || ord_char == 'd') |
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84 selector = select_dig; |
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85 else |
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86 selector = 0; |
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87 |
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88 int n = a_nc; |
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89 int lwork = 8 * n; |
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90 int liwork = 1; |
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91 int info; |
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92 int sdim; |
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93 double rconde; |
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94 double rcondv; |
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95 |
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96 schur_mat = a; |
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97 unitary_mat.resize (n, n); |
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98 |
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99 double *s = schur_mat.fortran_vec (); |
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100 double *q = unitary_mat.fortran_vec (); |
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101 |
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102 Array<double> wr (n); |
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103 double *pwr = wr.fortran_vec (); |
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104 |
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105 Array<double> wi (n); |
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106 double *pwi = wi.fortran_vec (); |
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107 |
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108 Array<double> work (lwork); |
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109 double *pwork = work.fortran_vec (); |
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110 |
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111 // These are not referenced for the non-ordered Schur routine. |
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112 |
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113 Array<int> bwork; |
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114 Array<int> iwork; |
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115 |
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116 if (ord_char == 'A' || ord_char == 'D' || ord_char == 'a' || ord_char == 'd') |
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117 { |
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118 bwork.resize (n); |
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119 iwork.resize (liwork); |
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120 } |
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121 |
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122 int *pbwork = bwork.fortran_vec (); |
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123 int *piwork = iwork.fortran_vec (); |
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124 |
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125 |
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126 F77_XFCN (dgeesx, DGEESX, (&jobvs, &sort, selector, &sense, n, s, |
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127 n, sdim, pwr, pwi, q, n, rconde, rcondv, |
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128 pwork, lwork, piwork, liwork, pbwork, |
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129 info, 1L, 1L)); |
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130 |
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131 if (f77_exception_encountered) |
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132 (*current_liboctave_error_handler) ("unrecoverable error in dgeesx"); |
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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 ostream& |
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138 operator << (ostream& os, const SCHUR& a) |
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139 { |
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140 os << a.schur_matrix () << "\n"; |
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141 os << a.unitary_matrix () << "\n"; |
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142 |
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143 return os; |
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144 } |
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145 |
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146 /* |
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147 ;;; Local Variables: *** |
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148 ;;; mode: C++ *** |
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149 ;;; End: *** |
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150 */ |
