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author John W. Eaton <jwe@octave.org>
date Sat, 07 Mar 2009 13:28:03 -0500
parents a5e080076778
children 4c0cdbe0acca
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1 /*
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2
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3 Copyright (C) 1994, 1995, 1996, 1997, 2000, 2002, 2003, 2004, 2005,
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4 2007 John W. Eaton
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5 Copyright (C) 2008 Jaroslav Hajek
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6
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7 This file is part of Octave.
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8
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9 Octave is free software; you can redistribute it and/or modify it
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10 under the terms of the GNU General Public License as published by the
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11 Free Software Foundation; either version 3 of the License, or (at your
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12 option) any later version.
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13
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14 Octave is distributed in the hope that it will be useful, but WITHOUT
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15 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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16 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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17 for more details.
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18
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19 You should have received a copy of the GNU General Public License
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20 along with Octave; see the file COPYING. If not, see
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21 <http://www.gnu.org/licenses/>.
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22
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23 */
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24
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25 #ifdef HAVE_CONFIG_H
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26 #include <config.h>
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27 #endif
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28
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29 #include <string>
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30
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31 #include "fCmplxAEPBAL.h"
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32 #include "fMatrix.h"
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33 #include "f77-fcn.h"
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34
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35 extern "C"
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36 {
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37 F77_RET_T
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38 F77_FUNC (cgebal, CGEBAL) (F77_CONST_CHAR_ARG_DECL, const octave_idx_type&,
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39 FloatComplex*, const octave_idx_type&,
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40 octave_idx_type&, octave_idx_type&, float*,
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41 octave_idx_type& F77_CHAR_ARG_LEN_DECL);
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42
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43 F77_RET_T
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44 F77_FUNC (cgebak, CGEBAK) (F77_CONST_CHAR_ARG_DECL, F77_CONST_CHAR_ARG_DECL,
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45 const octave_idx_type&, const octave_idx_type&,
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46 const octave_idx_type&, const float*,
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47 const octave_idx_type&, FloatComplex*,
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48 const octave_idx_type&, octave_idx_type&
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49 F77_CHAR_ARG_LEN_DECL F77_CHAR_ARG_LEN_DECL);
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50 }
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51
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52 FloatComplexAEPBALANCE::FloatComplexAEPBALANCE (const FloatComplexMatrix& a,
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53 bool noperm, bool noscal)
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54 : base_aepbal<FloatComplexMatrix, FloatColumnVector> ()
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55 {
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56 octave_idx_type n = a.cols ();
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57
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58 if (a.rows () != n)
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59 {
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60 (*current_liboctave_error_handler) ("AEPBALANCE requires square matrix");
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61 return;
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62 }
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63
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64 octave_idx_type info;
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65
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66 scale = FloatColumnVector (n);
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67 float *pscale = scale.fortran_vec ();
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68
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69 balanced_mat = a;
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70 FloatComplex *p_balanced_mat = balanced_mat.fortran_vec ();
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71
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72 job = noperm ? (noscal ? 'N' : 'S') : (noscal ? 'P' : 'B');
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73
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74 F77_XFCN (cgebal, CGEBAL, (F77_CONST_CHAR_ARG2 (&job, 1),
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75 n, p_balanced_mat, n, ilo, ihi,
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76 pscale, info
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77 F77_CHAR_ARG_LEN (1)));
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78 }
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79
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80 FloatComplexMatrix
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81 FloatComplexAEPBALANCE::balancing_matrix (void) const
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82 {
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83 octave_idx_type n = balanced_mat.rows ();
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84 FloatComplexMatrix balancing_mat (n, n, 0.0);
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85 for (octave_idx_type i = 0; i < n; i++)
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86 balancing_mat.elem (i, i) = 1.0;
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87
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88 FloatComplex *p_balancing_mat = balancing_mat.fortran_vec ();
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89 const float *pscale = scale.fortran_vec ();
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90
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91 octave_idx_type info;
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92
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93 char side = 'R';
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94
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95 F77_XFCN (cgebak, CGEBAK, (F77_CONST_CHAR_ARG2 (&job, 1),
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96 F77_CONST_CHAR_ARG2 (&side, 1),
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97 n, ilo, ihi, pscale, n,
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98 p_balancing_mat, n, info
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99 F77_CHAR_ARG_LEN (1)
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100 F77_CHAR_ARG_LEN (1)));
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101
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102 return balancing_mat;
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103 }
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104
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105 /*
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106 ;;; Local Variables: ***
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107 ;;; mode: C++ ***
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108 ;;; End: ***
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109 */