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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 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, 675 Mass Ave, Cambridge, MA 02139, USA. |
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21 |
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22 */ |
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23 |
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24 #ifdef HAVE_CONFIG_H |
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25 #include "config.h" |
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26 #endif |
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27 |
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28 #if defined (__GNUG__) |
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29 #pragma implementation |
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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 "mx-inlines.cc" |
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34 #include "lo-error.h" |
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35 #include "f77-uscore.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 (zgeesx) (const char*, const char*, int (*)(Complex*), |
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40 const char*, const int*, Complex*, const int*, |
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41 int*, Complex*, Complex*, const int*, double*, |
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42 double*, Complex*, const int*, double*, int*, |
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43 int*, long, long); |
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44 } |
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45 |
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46 static int |
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47 complex_select_ana (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 complex_select_dig (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 char *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 if (a_nr != a_nc) |
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64 { |
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65 (*current_liboctave_error_handler) |
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66 ("ComplexSCHUR requires square matrix"); |
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67 return -1; |
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68 } |
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69 |
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70 char jobvs = 'V'; |
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71 char sort; |
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72 if (*ord == 'A' || *ord == 'D' || *ord == 'a' || *ord == 'd') |
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73 sort = 'S'; |
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74 else |
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75 sort = 'N'; |
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76 |
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77 char sense = 'N'; |
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78 |
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79 int n = a_nc; |
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80 int lwork = 8 * n; |
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81 int info; |
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82 int sdim; |
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83 double rconde; |
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84 double rcondv; |
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85 |
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86 double *rwork = new double [n]; |
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87 |
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88 // bwork is not referenced for non-ordered Schur. |
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89 |
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90 int *bwork = (int *) NULL; |
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91 if (*ord == 'A' || *ord == 'D' || *ord == 'a' || *ord == 'd') |
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92 bwork = new int [n]; |
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93 |
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94 Complex *s = dup (a.data (), a.length ()); |
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95 |
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96 Complex *work = new Complex [lwork]; |
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97 Complex *q = new Complex [n*n]; |
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98 Complex *w = new Complex [n]; |
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99 |
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100 if (*ord == 'A' || *ord == 'a') |
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101 { |
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102 F77_FCN (zgeesx) (&jobvs, &sort, complex_select_ana, &sense, |
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103 &n, s, &n, &sdim, w, q, &n, &rconde, &rcondv, |
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104 work, &lwork, rwork, bwork, &info, 1L, 1L); |
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105 } |
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106 else if (*ord == 'D' || *ord == 'd') |
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107 { |
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108 F77_FCN (zgeesx) (&jobvs, &sort, complex_select_dig, &sense, |
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109 &n, s, &n, &sdim, w, q, &n, &rconde, &rcondv, |
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110 work, &lwork, rwork, bwork, &info, 1L, 1L); |
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111 } |
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112 else |
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113 { |
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114 F77_FCN (zgeesx) (&jobvs, &sort, (void *) 0, &sense, &n, s, |
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115 &n, &sdim, w, q, &n, &rconde, &rcondv, work, |
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116 &lwork, rwork, bwork, &info, 1L, 1L); |
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117 } |
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118 |
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119 schur_mat = ComplexMatrix (s,n,n); |
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120 unitary_mat = ComplexMatrix (q,n,n); |
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121 |
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122 delete [] w; |
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123 delete [] work; |
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124 delete [] rwork; |
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125 delete [] bwork; |
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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 */ |
