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annotate liboctave/fCmplxHESS.cc @ 12312:b10ea6efdc58 release-3-4-x ss-3-3-91

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version is now 3.3.91
author John W. Eaton <jwe@octave.org>
date Mon, 31 Jan 2011 08:36:58 -0500
parents 12df7854fa7c
children 72c96de7a403
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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 "fCmplxHESS.h"
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28 #include "f77-fcn.h"
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29 #include "lo-error.h"
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30
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31 extern "C"
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32 {
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33 F77_RET_T
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34 F77_FUNC (cgebal, CGEBAL) (F77_CONST_CHAR_ARG_DECL,
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35 const octave_idx_type&, FloatComplex*,
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36 const octave_idx_type&, octave_idx_type&,
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37 octave_idx_type&, float*, octave_idx_type&
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38 F77_CHAR_ARG_LEN_DECL);
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39
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40 F77_RET_T
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41 F77_FUNC (cgehrd, CGEHRD) (const octave_idx_type&, const octave_idx_type&,
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42 const octave_idx_type&, FloatComplex*,
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43 const octave_idx_type&, FloatComplex*,
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44 FloatComplex*, const octave_idx_type&,
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45 octave_idx_type&);
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46
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47 F77_RET_T
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48 F77_FUNC (cunghr, CUNGHR) (const octave_idx_type&, const octave_idx_type&,
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49 const octave_idx_type&, FloatComplex*,
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50 const octave_idx_type&, FloatComplex*,
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51 FloatComplex*, const octave_idx_type&,
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52 octave_idx_type&);
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53
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54 F77_RET_T
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55 F77_FUNC (cgebak, CGEBAK) (F77_CONST_CHAR_ARG_DECL,
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56 F77_CONST_CHAR_ARG_DECL,
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57 const octave_idx_type&, const octave_idx_type&,
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58 const octave_idx_type&, float*,
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59 const octave_idx_type&, FloatComplex*,
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60 const octave_idx_type&, octave_idx_type&
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61 F77_CHAR_ARG_LEN_DECL
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62 F77_CHAR_ARG_LEN_DECL);
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63 }
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64
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65 octave_idx_type
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66 FloatComplexHESS::init (const FloatComplexMatrix& a)
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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 ("FloatComplexHESS requires square matrix");
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75 return -1;
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76 }
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77
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78 char job = 'N';
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79 char side = 'R';
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80
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81 octave_idx_type n = a_nc;
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82 octave_idx_type lwork = 32 * n;
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83 octave_idx_type info;
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84 octave_idx_type ilo;
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85 octave_idx_type ihi;
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86
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87 hess_mat = a;
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88 FloatComplex *h = hess_mat.fortran_vec ();
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89
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90 Array<float> scale (dim_vector (n, 1));
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91 float *pscale = scale.fortran_vec ();
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92
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93 F77_XFCN (cgebal, CGEBAL, (F77_CONST_CHAR_ARG2 (&job, 1),
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94 n, h, n, ilo, ihi, pscale, info
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95 F77_CHAR_ARG_LEN (1)));
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96
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97 Array<FloatComplex> tau (dim_vector (n-1, 1));
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98 FloatComplex *ptau = tau.fortran_vec ();
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99
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100 Array<FloatComplex> work (dim_vector (lwork, 1));
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101 FloatComplex *pwork = work.fortran_vec ();
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102
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103 F77_XFCN (cgehrd, CGEHRD, (n, ilo, ihi, h, n, ptau, pwork, lwork, info));
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104
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105 unitary_hess_mat = hess_mat;
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106 FloatComplex *z = unitary_hess_mat.fortran_vec ();
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107
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108 F77_XFCN (cunghr, CUNGHR, (n, ilo, ihi, z, n, ptau, pwork,
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109 lwork, info));
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110
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111 F77_XFCN (cgebak, CGEBAK, (F77_CONST_CHAR_ARG2 (&job, 1),
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112 F77_CONST_CHAR_ARG2 (&side, 1),
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113 n, ilo, ihi, pscale, n, z, n, info
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114 F77_CHAR_ARG_LEN (1)
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115 F77_CHAR_ARG_LEN (1)));
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116
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117 // If someone thinks of a more graceful way of
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118 // doing this (or faster for that matter :-)),
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119 // please let me know!
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120
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121 if (n > 2)
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122 for (octave_idx_type j = 0; j < a_nc; j++)
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123 for (octave_idx_type i = j+2; i < a_nr; i++)
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124 hess_mat.elem (i, j) = 0;
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125
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126 return info;
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127 }