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1 /* |
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2 |
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3 Copyright (C) 1996, 1997 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 "CmplxSCHUR.h" |
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32 #include "f77-fcn.h" |
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33 #include "lo-error.h" |
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34 |
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35 extern "C" |
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36 { |
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37 int F77_FCN (zgeesx, ZGEESX) (const char*, const char*, |
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38 ComplexSCHUR::select_function, |
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39 const char*, const int&, Complex*, |
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40 const int&, int&, Complex*, Complex*, |
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41 const int&, double&, double&, |
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42 Complex*, const int&, double*, int*, |
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43 int&, long, long, long); |
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44 } |
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45 |
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46 static int |
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47 select_ana (const Complex& a) |
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48 { |
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49 return a.real () < 0.0; |
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50 } |
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51 |
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52 static int |
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53 select_dig (const Complex& a) |
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54 { |
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55 return (abs (a) < 1.0); |
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56 } |
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57 |
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58 int |
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59 ComplexSCHUR::init (const ComplexMatrix& a, const std::string& ord) |
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60 { |
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61 int a_nr = a.rows (); |
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62 int a_nc = a.cols (); |
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63 |
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64 if (a_nr != a_nc) |
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65 { |
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66 (*current_liboctave_error_handler) |
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67 ("ComplexSCHUR 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 // Workspace requirements may need to be fixed if any of the |
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72 // following change. |
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73 |
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74 char jobvs = 'V'; |
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75 char sense = 'N'; |
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76 char sort = 'N'; |
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77 |
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78 char ord_char = ord.empty () ? 'U' : ord[0]; |
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79 |
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80 if (ord_char == 'A' || ord_char == 'D' || ord_char == 'a' || ord_char == 'd') |
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81 sort = 'S'; |
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82 |
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83 if (ord_char == 'A' || ord_char == 'a') |
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84 selector = select_ana; |
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85 else if (ord_char == 'D' || ord_char == 'd') |
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86 selector = select_dig; |
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87 else |
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88 selector = 0; |
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89 |
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90 int n = a_nc; |
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91 int lwork = 8 * n; |
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92 int info; |
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93 int sdim; |
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94 double rconde; |
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95 double rcondv; |
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96 |
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97 schur_mat = a; |
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98 unitary_mat.resize (n, n); |
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99 |
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100 Complex *s = schur_mat.fortran_vec (); |
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101 Complex *q = unitary_mat.fortran_vec (); |
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102 |
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103 Array<double> rwork (n); |
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104 double *prwork = rwork.fortran_vec (); |
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105 |
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106 Array<Complex> w (n); |
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107 Complex *pw = w.fortran_vec (); |
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108 |
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109 Array<Complex> work (lwork); |
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110 Complex *pwork = work.fortran_vec (); |
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111 |
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112 // BWORK is not referenced for non-ordered Schur. |
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113 Array<int> bwork ((ord_char == 'N' || ord_char == 'n') ? 0 : n); |
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114 int *pbwork = bwork.fortran_vec (); |
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115 |
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116 F77_XFCN (zgeesx, ZGEESX, (&jobvs, &sort, selector, &sense, n, s, n, |
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117 sdim, pw, q, n, rconde, rcondv, pwork, |
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118 lwork, prwork, pbwork, info, 1L, 1L, 1L)); |
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119 |
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120 if (f77_exception_encountered) |
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121 (*current_liboctave_error_handler) ("unrecoverable error in zgeesx"); |
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122 |
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123 return info; |
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124 } |
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125 |
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126 /* |
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127 ;;; Local Variables: *** |
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128 ;;; mode: C++ *** |
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129 ;;; End: *** |
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130 */ |
