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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 "CmplxSCHUR.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 (zgeesx, ZGEESX) (const char*, const char*, |
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40 ComplexSCHUR::select_function, |
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41 const char*, const int&, Complex*, |
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42 const int&, int&, Complex*, Complex*, |
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43 const int&, double&, double&, |
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44 Complex*, const int&, double*, 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 Complex& a) |
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50 { |
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51 return a.real () < 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 Complex& a) |
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56 { |
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57 return (abs (a) < 1.0); |
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58 } |
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59 |
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60 int |
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61 ComplexSCHUR::init (const ComplexMatrix& 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) |
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69 ("ComplexSCHUR requires square matrix"); |
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70 return -1; |
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71 } |
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72 |
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73 char jobvs = 'V'; |
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74 char sense = 'N'; |
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75 char sort = 'N'; |
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76 |
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77 char ord_char = ord.empty () ? 'U' : ord[0]; |
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78 |
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79 if (ord_char == 'A' || ord_char == 'D' || ord_char == 'a' || ord_char == 'd') |
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80 sort = 'S'; |
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81 |
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82 if (ord_char == 'A' || ord_char == 'a') |
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83 selector = select_ana; |
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84 else if (ord_char == 'D' || ord_char == 'd') |
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85 selector = select_dig; |
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86 else |
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87 selector = 0; |
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88 |
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89 int n = a_nc; |
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90 int lwork = 8 * n; |
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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 Complex *s = schur_mat.fortran_vec (); |
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100 Complex *q = unitary_mat.fortran_vec (); |
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101 |
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102 Array<double> rwork (n); |
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103 double *prwork = rwork.fortran_vec (); |
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104 |
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105 Array<Complex> w (n); |
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106 Complex *pw = w.fortran_vec (); |
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107 |
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108 Array<Complex> work (lwork); |
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109 Complex *pwork = work.fortran_vec (); |
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110 |
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111 // bwork is not referenced for non-ordered Schur. |
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112 |
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113 Array<int> bwork; |
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114 |
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115 if (ord_char == 'A' || ord_char == 'D' || ord_char == 'a' || ord_char == 'd') |
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116 bwork.resize (n); |
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117 |
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118 int *pbwork = bwork.fortran_vec (); |
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119 |
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120 F77_XFCN (zgeesx, ZGEESX, (&jobvs, &sort, selector, &sense, n, s, n, |
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121 sdim, pw, q, n, rconde, rcondv, pwork, |
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122 lwork, prwork, pbwork, info, 1L, 1L)); |
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123 |
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124 if (f77_exception_encountered) |
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125 (*current_liboctave_error_handler) ("unrecoverable error in zgeesx"); |
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126 |
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127 return info; |
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128 } |
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129 |
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130 /* |
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131 ;;; Local Variables: *** |
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132 ;;; mode: C++ *** |
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133 ;;; page-delimiter: "^/\\*" *** |
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134 ;;; End: *** |
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135 */ |
