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annotate liboctave/fCmplxSCHUR.cc @ 10822:23d2378512a0

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implement rsf2csf
author Jaroslav Hajek <highegg@gmail.com>
date Tue, 27 Jul 2010 11:26:43 +0200
parents f7501986e42d
children 8a5e980da6aa
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1 /*
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2
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3 Copyright (C) 1994, 1995, 1996, 1997, 1999, 2000, 2002, 2003, 2004,
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4 2005, 2007, 2008 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 3 of the License, or (at your
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11 option) any 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, see
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20 <http://www.gnu.org/licenses/>.
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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 #include "fCmplxSCHUR.h"
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29 #include "f77-fcn.h"
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30 #include "lo-error.h"
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31 #include "oct-locbuf.h"
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32
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33 extern "C"
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34 {
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35 F77_RET_T
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36 F77_FUNC (cgeesx, CGEESX) (F77_CONST_CHAR_ARG_DECL,
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37 F77_CONST_CHAR_ARG_DECL,
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38 FloatComplexSCHUR::select_function,
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39 F77_CONST_CHAR_ARG_DECL,
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40 const octave_idx_type&, FloatComplex*, const octave_idx_type&, octave_idx_type&,
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41 FloatComplex*, FloatComplex*, const octave_idx_type&, float&,
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42 float&, FloatComplex*, const octave_idx_type&, float*, octave_idx_type*,
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43 octave_idx_type&
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44 F77_CHAR_ARG_LEN_DECL
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45 F77_CHAR_ARG_LEN_DECL
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46 F77_CHAR_ARG_LEN_DECL);
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47 F77_RET_T
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48 F77_FUNC (crsf2csf, CRSF2CSF) (const octave_idx_type&,
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49 FloatComplex *, FloatComplex *, float *, float *);
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50 }
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51
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52 static octave_idx_type
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53 select_ana (const FloatComplex& a)
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54 {
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55 return a.real () < 0.0;
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56 }
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57
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58 static octave_idx_type
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59 select_dig (const FloatComplex& a)
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60 {
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61 return (abs (a) < 1.0);
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62 }
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63
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64 octave_idx_type
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65 FloatComplexSCHUR::init (const FloatComplexMatrix& a, const std::string& ord,
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66 bool calc_unitary)
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67 {
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68 octave_idx_type a_nr = a.rows ();
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69 octave_idx_type a_nc = a.cols ();
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70
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71 if (a_nr != a_nc)
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72 {
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73 (*current_liboctave_error_handler)
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74 ("FloatComplexSCHUR requires square matrix");
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75 return -1;
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76 }
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77 else if (a_nr == 0)
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78 {
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79 schur_mat.clear ();
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80 unitary_mat.clear ();
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81 return 0;
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82 }
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83
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84 // Workspace requirements may need to be fixed if any of the
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85 // following change.
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86
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87 char jobvs;
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88 char sense = 'N';
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89 char sort = 'N';
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90
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91 if (calc_unitary)
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92 jobvs = 'V';
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93 else
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94 jobvs = 'N';
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95
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96 char ord_char = ord.empty () ? 'U' : ord[0];
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97
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98 if (ord_char == 'A' || ord_char == 'D' || ord_char == 'a' || ord_char == 'd')
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99 sort = 'S';
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100
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101 if (ord_char == 'A' || ord_char == 'a')
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102 selector = select_ana;
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103 else if (ord_char == 'D' || ord_char == 'd')
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104 selector = select_dig;
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105 else
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106 selector = 0;
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107
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108 octave_idx_type n = a_nc;
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109 octave_idx_type lwork = 8 * n;
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110 octave_idx_type info;
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111 octave_idx_type sdim;
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112 float rconde;
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113 float rcondv;
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114
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115 schur_mat = a;
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116 if (calc_unitary)
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117 unitary_mat.clear (n, n);
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118
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119 FloatComplex *s = schur_mat.fortran_vec ();
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120 FloatComplex *q = unitary_mat.fortran_vec ();
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121
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122 Array<float> rwork (n, 1);
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123 float *prwork = rwork.fortran_vec ();
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124
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125 Array<FloatComplex> w (n, 1);
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126 FloatComplex *pw = w.fortran_vec ();
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127
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128 Array<FloatComplex> work (lwork, 1);
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129 FloatComplex *pwork = work.fortran_vec ();
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130
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131 // BWORK is not referenced for non-ordered Schur.
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132 Array<octave_idx_type> bwork ((ord_char == 'N' || ord_char == 'n') ? 0 : n, 1);
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133 octave_idx_type *pbwork = bwork.fortran_vec ();
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134
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135 F77_XFCN (cgeesx, CGEESX, (F77_CONST_CHAR_ARG2 (&jobvs, 1),
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136 F77_CONST_CHAR_ARG2 (&sort, 1),
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137 selector,
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138 F77_CONST_CHAR_ARG2 (&sense, 1),
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139 n, s, n, sdim, pw, q, n, rconde, rcondv,
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140 pwork, lwork, prwork, pbwork, info
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141 F77_CHAR_ARG_LEN (1)
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142 F77_CHAR_ARG_LEN (1)
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143 F77_CHAR_ARG_LEN (1)));
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144
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145 return info;
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146 }
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147
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148 FloatComplexSCHUR::FloatComplexSCHUR (const FloatComplexMatrix& s,
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149 const FloatComplexMatrix& u)
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150 : schur_mat (s), unitary_mat (u)
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151 {
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152 octave_idx_type n = s.rows ();
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153 if (s.columns () != n || u.rows () != n || u.columns () != n)
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154 (*current_liboctave_error_handler)
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155 ("schur: inconsistent matrix dimensions");
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156 }
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157
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158 FloatComplexSCHUR::FloatComplexSCHUR (const FloatSCHUR& s)
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159 : schur_mat (s.schur_matrix ()), unitary_mat (s.unitary_matrix ())
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Jaroslav Hajek <highegg@gmail.com>
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160 {
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Jaroslav Hajek <highegg@gmail.com>
parents: 10607
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161 octave_idx_type n = schur_mat.rows ();
23d2378512a0 implement rsf2csf
Jaroslav Hajek <highegg@gmail.com>
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162 if (n > 0)
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163 {
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164 OCTAVE_LOCAL_BUFFER (float, c, n-1);
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Jaroslav Hajek <highegg@gmail.com>
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165 OCTAVE_LOCAL_BUFFER (float, sx, n-1);
23d2378512a0 implement rsf2csf
Jaroslav Hajek <highegg@gmail.com>
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166
23d2378512a0 implement rsf2csf
Jaroslav Hajek <highegg@gmail.com>
parents: 10607
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167 F77_XFCN (crsf2csf, CRSF2CSF, (n, schur_mat.fortran_vec (),
23d2378512a0 implement rsf2csf
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168 unitary_mat.fortran_vec (), c, sx));
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169 }
23d2378512a0 implement rsf2csf
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parents: 10607
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170 }