Mercurial > octave
annotate liboctave/fCmplxSVD.cc @ 11518:141b3fb5cef7
style fixes
author | John W. Eaton <jwe@octave.org> |
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date | Thu, 13 Jan 2011 16:52:30 -0500 |
parents | 8a5e980da6aa |
children | fd0a3ac60b0e |
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1 /* |
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2 |
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3 Copyright (C) 1994, 1995, 1996, 1997, 1999, 2002, 2003, 2004, 2005, |
8920 | 4 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 "fCmplxSVD.h" |
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29 #include "f77-fcn.h" |
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30 #include "lo-error.h" |
10601 | 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 (cgesvd, CGESVD) (F77_CONST_CHAR_ARG_DECL, |
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37 F77_CONST_CHAR_ARG_DECL, |
11495 | 38 const octave_idx_type&, const octave_idx_type&, |
39 FloatComplex*, const octave_idx_type&, float*, | |
40 FloatComplex*, const octave_idx_type&, | |
41 FloatComplex*, const octave_idx_type&, | |
42 FloatComplex*, const octave_idx_type&, | |
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43 float*, octave_idx_type& |
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44 F77_CHAR_ARG_LEN_DECL |
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45 F77_CHAR_ARG_LEN_DECL); |
10601 | 46 |
47 F77_RET_T | |
48 F77_FUNC (cgesdd, CGESDD) (F77_CONST_CHAR_ARG_DECL, | |
11495 | 49 const octave_idx_type&, const octave_idx_type&, |
50 FloatComplex*, const octave_idx_type&, float*, | |
51 FloatComplex*, const octave_idx_type&, | |
52 FloatComplex*, const octave_idx_type&, | |
53 FloatComplex*, const octave_idx_type&, | |
10601 | 54 float*, octave_idx_type *, octave_idx_type& |
55 F77_CHAR_ARG_LEN_DECL); | |
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56 } |
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57 |
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58 FloatComplexMatrix |
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59 FloatComplexSVD::left_singular_matrix (void) const |
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60 { |
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61 if (type_computed == SVD::sigma_only) |
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62 { |
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63 (*current_liboctave_error_handler) |
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64 ("FloatComplexSVD: U not computed because type == SVD::sigma_only"); |
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65 return FloatComplexMatrix (); |
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66 } |
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67 else |
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68 return left_sm; |
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69 } |
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70 |
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71 FloatComplexMatrix |
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72 FloatComplexSVD::right_singular_matrix (void) const |
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73 { |
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74 if (type_computed == SVD::sigma_only) |
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75 { |
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76 (*current_liboctave_error_handler) |
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77 ("FloatComplexSVD: V not computed because type == SVD::sigma_only"); |
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78 return FloatComplexMatrix (); |
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79 } |
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80 else |
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81 return right_sm; |
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82 } |
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83 |
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84 octave_idx_type |
11518 | 85 FloatComplexSVD::init (const FloatComplexMatrix& a, SVD::type svd_type, |
86 SVD::driver svd_driver) | |
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87 { |
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88 octave_idx_type info; |
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89 |
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90 octave_idx_type m = a.rows (); |
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91 octave_idx_type n = a.cols (); |
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92 |
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93 FloatComplexMatrix atmp = a; |
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94 FloatComplex *tmp_data = atmp.fortran_vec (); |
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95 |
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96 octave_idx_type min_mn = m < n ? m : n; |
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97 octave_idx_type max_mn = m > n ? m : n; |
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98 |
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99 char jobu = 'A'; |
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100 char jobv = 'A'; |
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101 |
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102 octave_idx_type ncol_u = m; |
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103 octave_idx_type nrow_vt = n; |
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104 octave_idx_type nrow_s = m; |
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105 octave_idx_type ncol_s = n; |
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106 |
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107 switch (svd_type) |
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108 { |
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109 case SVD::economy: |
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110 jobu = jobv = 'S'; |
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111 ncol_u = nrow_vt = nrow_s = ncol_s = min_mn; |
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112 break; |
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113 |
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114 case SVD::sigma_only: |
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115 |
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116 // Note: for this case, both jobu and jobv should be 'N', but |
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117 // there seems to be a bug in dgesvd from Lapack V2.0. To |
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118 // demonstrate the bug, set both jobu and jobv to 'N' and find |
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119 // the singular values of [eye(3), eye(3)]. The result is |
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120 // [-sqrt(2), -sqrt(2), -sqrt(2)]. |
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121 // |
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122 // For Lapack 3.0, this problem seems to be fixed. |
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123 |
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124 jobu = 'N'; |
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125 jobv = 'N'; |
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126 ncol_u = nrow_vt = 1; |
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127 break; |
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128 |
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129 default: |
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130 break; |
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131 } |
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132 |
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133 type_computed = svd_type; |
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134 |
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135 if (! (jobu == 'N' || jobu == 'O')) |
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136 left_sm.resize (m, ncol_u); |
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137 |
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138 FloatComplex *u = left_sm.fortran_vec (); |
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139 |
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140 sigma.resize (nrow_s, ncol_s); |
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141 float *s_vec = sigma.fortran_vec (); |
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142 |
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143 if (! (jobv == 'N' || jobv == 'O')) |
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144 right_sm.resize (nrow_vt, n); |
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145 |
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146 FloatComplex *vt = right_sm.fortran_vec (); |
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147 |
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148 octave_idx_type lrwork = 5*max_mn; |
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149 |
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150 Array<float> rwork (lrwork, 1); |
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151 |
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152 // Ask ZGESVD what the dimension of WORK should be. |
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153 |
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154 octave_idx_type lwork = -1; |
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155 |
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156 Array<FloatComplex> work (1, 1); |
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157 |
10258 | 158 octave_idx_type one = 1; |
159 octave_idx_type m1 = std::max (m, one), nrow_vt1 = std::max (nrow_vt, one); | |
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160 |
10601 | 161 if (svd_driver == SVD::GESVD) |
162 { | |
163 F77_XFCN (cgesvd, CGESVD, (F77_CONST_CHAR_ARG2 (&jobu, 1), | |
164 F77_CONST_CHAR_ARG2 (&jobv, 1), | |
165 m, n, tmp_data, m1, s_vec, u, m1, vt, | |
166 nrow_vt1, work.fortran_vec (), lwork, | |
167 rwork.fortran_vec (), info | |
168 F77_CHAR_ARG_LEN (1) | |
169 F77_CHAR_ARG_LEN (1))); | |
170 | |
171 lwork = static_cast<octave_idx_type> (work(0).real ()); | |
172 work.resize (lwork, 1); | |
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173 |
10601 | 174 F77_XFCN (cgesvd, CGESVD, (F77_CONST_CHAR_ARG2 (&jobu, 1), |
175 F77_CONST_CHAR_ARG2 (&jobv, 1), | |
176 m, n, tmp_data, m1, s_vec, u, m1, vt, | |
177 nrow_vt1, work.fortran_vec (), lwork, | |
178 rwork.fortran_vec (), info | |
179 F77_CHAR_ARG_LEN (1) | |
180 F77_CHAR_ARG_LEN (1))); | |
181 } | |
182 else if (svd_driver == SVD::GESDD) | |
183 { | |
184 assert (jobu == jobv); | |
185 char jobz = jobu; | |
186 OCTAVE_LOCAL_BUFFER (octave_idx_type, iwork, 8*min_mn); | |
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parents:
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187 |
10601 | 188 F77_XFCN (cgesdd, CGESDD, (F77_CONST_CHAR_ARG2 (&jobz, 1), |
189 m, n, tmp_data, m1, s_vec, u, m1, vt, | |
190 nrow_vt1, work.fortran_vec (), lwork, | |
191 rwork.fortran_vec (), iwork, info | |
192 F77_CHAR_ARG_LEN (1))); | |
193 | |
194 lwork = static_cast<octave_idx_type> (work(0).real ()); | |
195 work.resize (lwork, 1); | |
196 | |
197 F77_XFCN (cgesdd, CGESDD, (F77_CONST_CHAR_ARG2 (&jobz, 1), | |
198 m, n, tmp_data, m1, s_vec, u, m1, vt, | |
199 nrow_vt1, work.fortran_vec (), lwork, | |
200 rwork.fortran_vec (), iwork, info | |
201 F77_CHAR_ARG_LEN (1))); | |
202 } | |
203 else | |
204 assert (0); // impossible | |
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205 |
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206 if (! (jobv == 'N' || jobv == 'O')) |
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207 right_sm = right_sm.hermitian (); |
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208 |
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209 return info; |
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210 } |