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annotate liboctave/floatHESS.cc @ 11495:8a5e980da6aa

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style fixes
author John W. Eaton <jwe@octave.org>
date Thu, 13 Jan 2011 02:09:02 -0500
parents 12884915a8e4
children fd0a3ac60b0e
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1 /*
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2
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eb63fbe60fab update copyright notices
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3 Copyright (C) 1994, 1995, 1996, 1997, 2002, 2003, 2004, 2005, 2007, 2008
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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
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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 "floatHESS.h"
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29 #include "f77-fcn.h"
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30 #include "lo-error.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 (sgebal, SGEBAL) (F77_CONST_CHAR_ARG_DECL,
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36 const octave_idx_type&, float*,
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37 const octave_idx_type&, octave_idx_type&,
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38 octave_idx_type&, float*, octave_idx_type&
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39 F77_CHAR_ARG_LEN_DECL);
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40
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41 F77_RET_T
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42 F77_FUNC (sgehrd, SGEHRD) (const octave_idx_type&, const octave_idx_type&,
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43 const octave_idx_type&, float*,
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44 const octave_idx_type&, float*, float*,
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45 const octave_idx_type&, octave_idx_type&);
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46
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47 F77_RET_T
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48 F77_FUNC (sorghr, SORGHR) (const octave_idx_type&, const octave_idx_type&,
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49 const octave_idx_type&, float*,
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50 const octave_idx_type&, float*, float*,
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51 const octave_idx_type&, octave_idx_type&);
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52
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53 F77_RET_T
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54 F77_FUNC (sgebak, SGEBAK) (F77_CONST_CHAR_ARG_DECL,
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55 F77_CONST_CHAR_ARG_DECL,
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56 const octave_idx_type&, const octave_idx_type&,
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57 const octave_idx_type&, float*,
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58 const octave_idx_type&, float*,
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59 const octave_idx_type&, octave_idx_type&
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60 F77_CHAR_ARG_LEN_DECL
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61 F77_CHAR_ARG_LEN_DECL);
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62 }
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63
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64 octave_idx_type
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65 FloatHESS::init (const FloatMatrix& a)
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66 {
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67 octave_idx_type a_nr = a.rows ();
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68 octave_idx_type a_nc = a.cols ();
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69
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70 if (a_nr != a_nc)
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71 {
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72 (*current_liboctave_error_handler) ("FloatHESS requires square matrix");
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73 return -1;
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74 }
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75
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76 char job = 'N';
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77 char side = 'R';
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78
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79 octave_idx_type n = a_nc;
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80 octave_idx_type lwork = 32 * n;
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81 octave_idx_type info;
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82 octave_idx_type ilo;
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83 octave_idx_type ihi;
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84
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85 hess_mat = a;
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86 float *h = hess_mat.fortran_vec ();
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87
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88 Array<float> scale (n, 1);
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89 float *pscale = scale.fortran_vec ();
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90
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91 F77_XFCN (sgebal, SGEBAL, (F77_CONST_CHAR_ARG2 (&job, 1),
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92 n, h, n, ilo, ihi, pscale, info
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93 F77_CHAR_ARG_LEN (1)));
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94
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95 Array<float> tau (n-1, 1);
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96 float *ptau = tau.fortran_vec ();
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97
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98 Array<float> work (lwork, 1);
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99 float *pwork = work.fortran_vec ();
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100
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101 F77_XFCN (sgehrd, SGEHRD, (n, ilo, ihi, h, n, ptau, pwork,
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102 lwork, info));
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103
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104 unitary_hess_mat = hess_mat;
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105 float *z = unitary_hess_mat.fortran_vec ();
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106
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107 F77_XFCN (sorghr, SORGHR, (n, ilo, ihi, z, n, ptau, pwork,
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108 lwork, info));
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109
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110 F77_XFCN (sgebak, SGEBAK, (F77_CONST_CHAR_ARG2 (&job, 1),
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111 F77_CONST_CHAR_ARG2 (&side, 1),
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112 n, ilo, ihi, pscale, n, z,
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113 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 doing
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118 // this (or faster for that matter :-)), please let
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119 // 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 }