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annotate src/DLD-FUNCTIONS/eig.cc @ 7789:82be108cc558

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First attempt at single precision tyeps * * * corrections to qrupdate single precision routines * * * prefer demotion to single over promotion to double * * * Add single precision support to log2 function * * * Trivial PROJECT file update * * * Cache optimized hermitian/transpose methods * * * Add tests for tranpose/hermitian and ChangeLog entry for new transpose code
author David Bateman <dbateman@free.fr>
date Sun, 27 Apr 2008 22:34:17 +0200
parents 91f8446ce4ae
children 87865ed7405f
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1 /*
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2
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3 Copyright (C) 1996, 1997, 1999, 2000, 2003, 2004, 2005, 2006, 2007
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4 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
7016
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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 "EIG.h"
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29 #include "fEIG.h"
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30
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31 #include "defun-dld.h"
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32 #include "error.h"
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33 #include "gripes.h"
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34 #include "oct-obj.h"
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35 #include "utils.h"
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36
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37 DEFUN_DLD (eig, args, nargout,
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38 "-*- texinfo -*-\n\
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39 @deftypefn {Loadable Function} {@var{lambda} =} eig (@var{a})\n\
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40 @deftypefnx {Loadable Function} {[@var{v}, @var{lambda}] =} eig (@var{a})\n\
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41 The eigenvalues (and eigenvectors) of a matrix are computed in a several\n\
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42 step process which begins with a Hessenberg decomposition, followed by a\n\
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43 Schur decomposition, from which the eigenvalues are apparent. The\n\
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44 eigenvectors, when desired, are computed by further manipulations of the\n\
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45 Schur decomposition.\n\
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46 \n\
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47 The eigenvalues returned by @code{eig} are not ordered.\n\
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48 @end deftypefn")
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49 {
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50 octave_value_list retval;
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51
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52 int nargin = args.length ();
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53
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54 if (nargin != 1 || nargout > 2)
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55 {
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56 print_usage ();
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57 return retval;
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58 }
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59
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60 octave_value arg = args(0);
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61
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62 octave_idx_type nr = arg.rows ();
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63 octave_idx_type nc = arg.columns ();
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64
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65 int arg_is_empty = empty_arg ("eig", nr, nc);
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66 if (arg_is_empty < 0)
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67 return retval;
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68 else if (arg_is_empty > 0)
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69 return octave_value_list (2, Matrix ());
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70
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71 if (nr != nc)
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72 {
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73 gripe_square_matrix_required ("eig");
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74 return retval;
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75 }
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76
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77 Matrix tmp;
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78 ComplexMatrix ctmp;
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79 FloatMatrix ftmp;
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80 FloatComplexMatrix fctmp;
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81
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82 if (arg.is_single_type ())
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83 {
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84 FloatEIG result;
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86 if (arg.is_real_type ())
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87 {
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88 ftmp = arg.float_matrix_value ();
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89
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90 if (error_state)
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91 return retval;
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92 else
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93 result = FloatEIG (ftmp, nargout > 1);
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94 }
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95 else if (arg.is_complex_type ())
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96 {
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97 fctmp = arg.float_complex_matrix_value ();
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98
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99 if (error_state)
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100 return retval;
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101 else
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102 result = FloatEIG (fctmp, nargout > 1);
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103 }
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104
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105 if (! error_state)
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106 {
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107 if (nargout == 0 || nargout == 1)
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108 {
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109 retval(0) = result.eigenvalues ();
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110 }
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111 else
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112 {
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113 // Blame it on Matlab.
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114
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115 FloatComplexDiagMatrix d (result.eigenvalues ());
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116
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117 retval(1) = d;
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118 retval(0) = result.eigenvectors ();
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119 }
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120 }
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121 }
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122 else
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123 {
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124 EIG result;
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125
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126 if (arg.is_real_type ())
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127 {
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128 tmp = arg.matrix_value ();
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130 if (error_state)
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131 return retval;
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132 else
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133 result = EIG (tmp, nargout > 1);
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134 }
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135 else if (arg.is_complex_type ())
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136 {
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137 ctmp = arg.complex_matrix_value ();
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138
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139 if (error_state)
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140 return retval;
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141 else
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142 result = EIG (ctmp, nargout > 1);
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143 }
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144 else
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145 {
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146 gripe_wrong_type_arg ("eig", tmp);
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147 return retval;
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148 }
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149
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150 if (! error_state)
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151 {
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152 if (nargout == 0 || nargout == 1)
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153 {
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154 retval(0) = result.eigenvalues ();
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155 }
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156 else
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157 {
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158 // Blame it on Matlab.
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159
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160 ComplexDiagMatrix d (result.eigenvalues ());
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161
82be108cc558 First attempt at single precision tyeps
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162 retval(1) = d;
82be108cc558 First attempt at single precision tyeps
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163 retval(0) = result.eigenvectors ();
82be108cc558 First attempt at single precision tyeps
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164 }
7578
91f8446ce4ae handle possible error from EIG
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165 }
2928
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166 }
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167
295f037b4b3e [project @ 1997-05-05 05:32:33 by jwe]
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168 return retval;
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169 }
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170
295f037b4b3e [project @ 1997-05-05 05:32:33 by jwe]
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171 /*
295f037b4b3e [project @ 1997-05-05 05:32:33 by jwe]
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172 ;;; Local Variables: ***
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173 ;;; mode: C++ ***
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174 ;;; End: ***
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175 */