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annotate liboctave/fCmplxSCHUR.cc @ 11584:cda4aa780d58

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Another round of initialising members in the constructor initialisation list
author Pascal Dupuis <Pascal.Dupuis@uclouvain.be>
date Thu, 20 Jan 2011 17:07:26 -0500
parents 57632dea2446
children 12df7854fa7c
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1 /*
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2
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3 Copyright (C) 1994-2011 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 3 of the License, or (at your
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10 option) any 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, see
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19 <http://www.gnu.org/licenses/>.
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20
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21 */
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22
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23 #ifdef HAVE_CONFIG_H
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24 #include <config.h>
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25 #endif
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26
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27 #include "fCmplxSCHUR.h"
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28 #include "f77-fcn.h"
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29 #include "lo-error.h"
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30 #include "oct-locbuf.h"
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31
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32 extern "C"
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33 {
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34 F77_RET_T
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35 F77_FUNC (cgeesx, CGEESX) (F77_CONST_CHAR_ARG_DECL,
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36 F77_CONST_CHAR_ARG_DECL,
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37 FloatComplexSCHUR::select_function,
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38 F77_CONST_CHAR_ARG_DECL,
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39 const octave_idx_type&, FloatComplex*,
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40 const octave_idx_type&, octave_idx_type&,
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41 FloatComplex*, FloatComplex*,
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42 const octave_idx_type&, float&, float&,
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43 FloatComplex*, const octave_idx_type&,
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44 float*, octave_idx_type*, octave_idx_type&
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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_CHAR_ARG_LEN_DECL);
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48 F77_RET_T
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49 F77_FUNC (crsf2csf, CRSF2CSF) (const octave_idx_type&, FloatComplex *,
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50 FloatComplex *, float *, float *);
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51 }
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52
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53 static octave_idx_type
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54 select_ana (const FloatComplex& a)
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55 {
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56 return a.real () < 0.0;
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57 }
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58
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59 static octave_idx_type
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60 select_dig (const FloatComplex& a)
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61 {
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62 return (abs (a) < 1.0);
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63 }
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64
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65 octave_idx_type
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66 FloatComplexSCHUR::init (const FloatComplexMatrix& a, const std::string& ord,
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67 bool calc_unitary)
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68 {
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69 octave_idx_type a_nr = a.rows ();
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70 octave_idx_type a_nc = a.cols ();
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71
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72 if (a_nr != a_nc)
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73 {
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74 (*current_liboctave_error_handler)
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75 ("FloatComplexSCHUR requires square matrix");
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76 return -1;
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77 }
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78 else if (a_nr == 0)
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79 {
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80 schur_mat.clear ();
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81 unitary_mat.clear ();
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82 return 0;
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83 }
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84
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85 // Workspace requirements may need to be fixed if any of the
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86 // following change.
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87
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88 char jobvs;
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89 char sense = 'N';
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90 char sort = 'N';
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91
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92 if (calc_unitary)
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93 jobvs = 'V';
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94 else
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95 jobvs = 'N';
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96
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97 char ord_char = ord.empty () ? 'U' : ord[0];
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98
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99 if (ord_char == 'A' || ord_char == 'D' || ord_char == 'a' || ord_char == 'd')
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100 sort = 'S';
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101
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102 if (ord_char == 'A' || ord_char == 'a')
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103 selector = select_ana;
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104 else if (ord_char == 'D' || ord_char == 'd')
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105 selector = select_dig;
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106 else
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107 selector = 0;
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108
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109 octave_idx_type n = a_nc;
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110 octave_idx_type lwork = 8 * n;
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111 octave_idx_type info;
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112 octave_idx_type sdim;
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113 float rconde;
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114 float rcondv;
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115
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116 schur_mat = a;
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117 if (calc_unitary)
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118 unitary_mat.clear (n, n);
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119
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120 FloatComplex *s = schur_mat.fortran_vec ();
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121 FloatComplex *q = unitary_mat.fortran_vec ();
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122
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123 Array<float> rwork (dim_vector (n, 1));
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124 float *prwork = rwork.fortran_vec ();
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125
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126 Array<FloatComplex> w (dim_vector (n, 1));
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127 FloatComplex *pw = w.fortran_vec ();
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128
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129 Array<FloatComplex> work (dim_vector (lwork, 1));
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130 FloatComplex *pwork = work.fortran_vec ();
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131
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132 // BWORK is not referenced for non-ordered Schur.
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133 octave_idx_type ntmp = (ord_char == 'N' || ord_char == 'n') ? 0 : n;
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134 Array<octave_idx_type> bwork (dim_vector (ntmp, 1));
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135 octave_idx_type *pbwork = bwork.fortran_vec ();
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136
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137 F77_XFCN (cgeesx, CGEESX, (F77_CONST_CHAR_ARG2 (&jobvs, 1),
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138 F77_CONST_CHAR_ARG2 (&sort, 1),
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139 selector,
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140 F77_CONST_CHAR_ARG2 (&sense, 1),
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141 n, s, n, sdim, pw, q, n, rconde, rcondv,
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142 pwork, lwork, prwork, pbwork, info
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143 F77_CHAR_ARG_LEN (1)
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144 F77_CHAR_ARG_LEN (1)
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145 F77_CHAR_ARG_LEN (1)));
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146
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147 return info;
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148 }
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149
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150 FloatComplexSCHUR::FloatComplexSCHUR (const FloatComplexMatrix& s,
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151 const FloatComplexMatrix& u)
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152 : schur_mat (s), unitary_mat (u), selector (0)
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153 {
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154 octave_idx_type n = s.rows ();
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155 if (s.columns () != n || u.rows () != n || u.columns () != n)
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156 (*current_liboctave_error_handler)
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157 ("schur: inconsistent matrix dimensions");
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158 }
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159
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160 FloatComplexSCHUR::FloatComplexSCHUR (const FloatSCHUR& s)
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161 : schur_mat (s.schur_matrix ()), unitary_mat (s.unitary_matrix ()),
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162 selector (0)
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163 {
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164 octave_idx_type n = schur_mat.rows ();
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165 if (n > 0)
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166 {
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167 OCTAVE_LOCAL_BUFFER (float, c, n-1);
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168 OCTAVE_LOCAL_BUFFER (float, sx, n-1);
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169
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170 F77_XFCN (crsf2csf, CRSF2CSF, (n, schur_mat.fortran_vec (),
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171 unitary_mat.fortran_vec (), c, sx));
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172 }
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173 }