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annotate liboctave/CmplxGEPBAL.cc @ 8920:eb63fbe60fab

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author John W. Eaton <jwe@octave.org>
date Sat, 07 Mar 2009 10:41:27 -0500
parents 25bc2d31e1bf
children 829e69ec3110
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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, 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 <string>
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29 #include <vector>
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30
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31 #include "CmplxGEPBAL.h"
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32 #include "Array-util.h"
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33 #include "f77-fcn.h"
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34 #include "oct-locbuf.h"
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35
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36 extern "C"
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37 {
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38 F77_RET_T
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39 F77_FUNC (zggbal, ZGGBAL) (F77_CONST_CHAR_ARG_DECL, const octave_idx_type& N,
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40 Complex* A, const octave_idx_type& LDA, Complex* B,
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41 const octave_idx_type& LDB, octave_idx_type& ILO, octave_idx_type& IHI,
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42 double* LSCALE, double* RSCALE,
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43 double* WORK, octave_idx_type& INFO
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44 F77_CHAR_ARG_LEN_DECL);
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45
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46 F77_RET_T
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47 F77_FUNC (dggbak, DGGBAK) (F77_CONST_CHAR_ARG_DECL,
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48 F77_CONST_CHAR_ARG_DECL,
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49 const octave_idx_type& N, const octave_idx_type& ILO,
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50 const octave_idx_type& IHI, const double* LSCALE,
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51 const double* RSCALE, octave_idx_type& M, double* V,
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52 const octave_idx_type& LDV, octave_idx_type& INFO
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53 F77_CHAR_ARG_LEN_DECL
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54 F77_CHAR_ARG_LEN_DECL);
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55
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56 }
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57
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58 octave_idx_type
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59 ComplexGEPBALANCE::init (const ComplexMatrix& a, const ComplexMatrix& b,
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60 const std::string& balance_job)
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61 {
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62 octave_idx_type n = a.cols ();
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63
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64 if (a.rows () != n)
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65 {
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66 (*current_liboctave_error_handler) ("ComplexGEPBALANCE requires square matrix");
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67 return -1;
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68 }
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69
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70 if (a.dims() != b.dims ())
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71 {
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72 gripe_nonconformant ("ComplexGEPBALANCE", n, n, b.rows(), b.cols());
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73 return -1;
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74 }
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75
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76 octave_idx_type info;
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77 octave_idx_type ilo;
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78 octave_idx_type ihi;
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79
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80 OCTAVE_LOCAL_BUFFER (double, plscale, n);
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81 OCTAVE_LOCAL_BUFFER (double, prscale, n);
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82 OCTAVE_LOCAL_BUFFER (double, pwork, 6 * n);
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83
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84 balanced_mat = a;
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85 Complex *p_balanced_mat = balanced_mat.fortran_vec ();
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86 balanced_mat2 = b;
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87 Complex *p_balanced_mat2 = balanced_mat2.fortran_vec ();
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88
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89 char job = balance_job[0];
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90
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91 F77_XFCN (zggbal, ZGGBAL, (F77_CONST_CHAR_ARG2 (&job, 1),
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92 n, p_balanced_mat, n, p_balanced_mat2,
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93 n, ilo, ihi, plscale, prscale, pwork, info
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94 F77_CHAR_ARG_LEN (1)));
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95
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96 balancing_mat = Matrix (n, n, 0.0);
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97 balancing_mat2 = Matrix (n, n, 0.0);
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98 for (octave_idx_type i = 0; i < n; i++)
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99 {
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100 OCTAVE_QUIT;
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101 balancing_mat.elem (i ,i) = 1.0;
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102 balancing_mat2.elem (i ,i) = 1.0;
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103 }
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104
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105 double *p_balancing_mat = balancing_mat.fortran_vec ();
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106 double *p_balancing_mat2 = balancing_mat2.fortran_vec ();
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107
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108 // first left
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109 F77_XFCN (dggbak, DGGBAK, (F77_CONST_CHAR_ARG2 (&job, 1),
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110 F77_CONST_CHAR_ARG2 ("L", 1),
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111 n, ilo, ihi, plscale, prscale,
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112 n, p_balancing_mat, n, info
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113 F77_CHAR_ARG_LEN (1)
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114 F77_CHAR_ARG_LEN (1)));
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115
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116 // then right
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117 F77_XFCN (dggbak, DGGBAK, (F77_CONST_CHAR_ARG2 (&job, 1),
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118 F77_CONST_CHAR_ARG2 ("R", 1),
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119 n, ilo, ihi, plscale, prscale,
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120 n, p_balancing_mat2, n, info
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121 F77_CHAR_ARG_LEN (1)
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122 F77_CHAR_ARG_LEN (1)));
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123
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124 return info;
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125 }
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126
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127 /*
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128 ;;; Local Variables: ***
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129 ;;; mode: C++ ***
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130 ;;; End: ***
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131 */