Mercurial > hg > octave-nkf
annotate liboctave/dbleSCHUR.cc @ 10822:23d2378512a0
implement rsf2csf
| author | Jaroslav Hajek <highegg@gmail.com> |
|---|---|
| date | Tue, 27 Jul 2010 11:26:43 +0200 |
| parents | f7501986e42d |
| children | 8a5e980da6aa |
| rev | line source |
|---|---|
| 457 | 1 /* |
| 2 | |
| 7017 | 3 Copyright (C) 1994, 1995, 1996, 1997, 1999, 2000, 2002, 2003, 2004, |
| 8920 | 4 2005, 2007, 2008 John W. Eaton |
| 457 | 5 |
| 6 This file is part of Octave. | |
| 7 | |
| 8 Octave is free software; you can redistribute it and/or modify it | |
| 9 under the terms of the GNU General Public License as published by the | |
| 7016 | 10 Free Software Foundation; either version 3 of the License, or (at your |
| 11 option) any later version. | |
| 457 | 12 |
| 13 Octave is distributed in the hope that it will be useful, but WITHOUT | |
| 14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 16 for more details. | |
| 17 | |
| 18 You should have received a copy of the GNU General Public License | |
| 7016 | 19 along with Octave; see the file COPYING. If not, see |
| 20 <http://www.gnu.org/licenses/>. | |
| 457 | 21 |
| 22 */ | |
| 23 | |
| 24 #ifdef HAVE_CONFIG_H | |
| 1192 | 25 #include <config.h> |
| 457 | 26 #endif |
| 27 | |
| 3503 | 28 #include <iostream> |
| 1631 | 29 |
| 457 | 30 #include "dbleSCHUR.h" |
| 1847 | 31 #include "f77-fcn.h" |
| 457 | 32 #include "lo-error.h" |
| 33 | |
| 34 extern "C" | |
| 35 { | |
| 4552 | 36 F77_RET_T |
| 37 F77_FUNC (dgeesx, DGEESX) (F77_CONST_CHAR_ARG_DECL, | |
|
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38 F77_CONST_CHAR_ARG_DECL, |
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39 SCHUR::select_function, |
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40 F77_CONST_CHAR_ARG_DECL, |
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41 const octave_idx_type&, double*, const octave_idx_type&, octave_idx_type&, |
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42 double*, double*, double*, const octave_idx_type&, |
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43 double&, double&, double*, const octave_idx_type&, |
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44 octave_idx_type*, const octave_idx_type&, 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); |
| 457 | 48 } |
| 49 | |
| 5275 | 50 static octave_idx_type |
| 1486 | 51 select_ana (const double& a, const double&) |
| 457 | 52 { |
| 1251 | 53 return (a < 0.0); |
| 457 | 54 } |
| 55 | |
| 5275 | 56 static octave_idx_type |
| 1251 | 57 select_dig (const double& a, const double& b) |
| 457 | 58 { |
| 1251 | 59 return (hypot (a, b) < 1.0); |
| 457 | 60 } |
| 61 | |
| 5275 | 62 octave_idx_type |
| 5008 | 63 SCHUR::init (const Matrix& a, const std::string& ord, bool calc_unitary) |
| 457 | 64 { |
| 5275 | 65 octave_idx_type a_nr = a.rows (); |
| 66 octave_idx_type a_nc = a.cols (); | |
| 1929 | 67 |
| 457 | 68 if (a_nr != a_nc) |
| 69 { | |
| 70 (*current_liboctave_error_handler) ("SCHUR requires square matrix"); | |
| 71 return -1; | |
| 72 } | |
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73 else if (a_nr == 0) |
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74 { |
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75 schur_mat.clear (); |
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76 unitary_mat.clear (); |
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77 return 0; |
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78 } |
| 457 | 79 |
| 3334 | 80 // Workspace requirements may need to be fixed if any of the |
| 81 // following change. | |
| 82 | |
| 5008 | 83 char jobvs; |
| 1930 | 84 char sense = 'N'; |
| 85 char sort = 'N'; | |
| 457 | 86 |
| 5008 | 87 if (calc_unitary) |
| 88 jobvs = 'V'; | |
| 89 else | |
| 90 jobvs = 'N'; | |
| 91 | |
| 1756 | 92 char ord_char = ord.empty () ? 'U' : ord[0]; |
| 93 | |
| 94 if (ord_char == 'A' || ord_char == 'D' || ord_char == 'a' || ord_char == 'd') | |
| 1930 | 95 sort = 'S'; |
| 457 | 96 |
| 1929 | 97 if (ord_char == 'A' || ord_char == 'a') |
| 98 selector = select_ana; | |
| 99 else if (ord_char == 'D' || ord_char == 'd') | |
| 100 selector = select_dig; | |
| 1930 | 101 else |
| 102 selector = 0; | |
| 457 | 103 |
| 5275 | 104 octave_idx_type n = a_nc; |
| 105 octave_idx_type lwork = 8 * n; | |
| 106 octave_idx_type liwork = 1; | |
| 107 octave_idx_type info; | |
| 108 octave_idx_type sdim; | |
| 457 | 109 double rconde; |
| 110 double rcondv; | |
| 111 | |
| 1929 | 112 schur_mat = a; |
| 5008 | 113 |
| 114 if (calc_unitary) | |
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115 unitary_mat.clear (n, n); |
| 1929 | 116 |
| 117 double *s = schur_mat.fortran_vec (); | |
| 118 double *q = unitary_mat.fortran_vec (); | |
| 457 | 119 |
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120 Array<double> wr (n, 1); |
| 1929 | 121 double *pwr = wr.fortran_vec (); |
| 122 | |
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123 Array<double> wi (n, 1); |
| 1929 | 124 double *pwi = wi.fortran_vec (); |
| 125 | |
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126 Array<double> work (lwork, 1); |
| 1929 | 127 double *pwork = work.fortran_vec (); |
| 457 | 128 |
| 3334 | 129 // BWORK is not referenced for the non-ordered Schur routine. |
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130 Array<octave_idx_type> bwork ((ord_char == 'N' || ord_char == 'n') ? 0 : n, 1); |
| 5275 | 131 octave_idx_type *pbwork = bwork.fortran_vec (); |
| 1929 | 132 |
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133 Array<octave_idx_type> iwork (liwork, 1); |
| 5275 | 134 octave_idx_type *piwork = iwork.fortran_vec (); |
| 1929 | 135 |
| 4552 | 136 F77_XFCN (dgeesx, DGEESX, (F77_CONST_CHAR_ARG2 (&jobvs, 1), |
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137 F77_CONST_CHAR_ARG2 (&sort, 1), |
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138 selector, |
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139 F77_CONST_CHAR_ARG2 (&sense, 1), |
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140 n, s, n, sdim, pwr, pwi, q, n, rconde, rcondv, |
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141 pwork, lwork, piwork, liwork, pbwork, info |
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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 F77_CHAR_ARG_LEN (1))); |
| 457 | 145 |
| 146 return info; | |
| 147 } | |
| 148 | |
| 3504 | 149 std::ostream& |
| 150 operator << (std::ostream& os, const SCHUR& a) | |
| 457 | 151 { |
| 152 os << a.schur_matrix () << "\n"; | |
| 153 os << a.unitary_matrix () << "\n"; | |
| 154 | |
| 155 return os; | |
| 156 } | |
| 10822 | 157 |
| 158 SCHUR::SCHUR (const Matrix& s, const Matrix& u) | |
| 159 : schur_mat (s), unitary_mat (u) | |
| 160 { | |
| 161 octave_idx_type n = s.rows (); | |
| 162 if (s.columns () != n || u.rows () != n || u.columns () != n) | |
| 163 (*current_liboctave_error_handler) | |
| 164 ("schur: inconsistent matrix dimensions"); | |
| 165 } | |
| 166 |