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1 /* |
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2 |
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3 Copyright (C) 1996, 1997 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 2, or (at your option) any |
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10 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, write to the Free |
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19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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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 <string> |
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28 |
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29 #include "dbleAEPBAL.h" |
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30 #include "f77-fcn.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 (dgebal, DGEBAL) (F77_CONST_CHAR_ARG_DECL, |
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36 const int&, double*, const int&, int&, |
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37 int&, double*, int& |
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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 (dgebak, DGEBAK) (F77_CONST_CHAR_ARG_DECL, |
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42 F77_CONST_CHAR_ARG_DECL, |
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43 const int&, const int&, const int&, double*, |
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44 const int&, double*, const int&, int& |
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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 } |
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48 |
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49 int |
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50 AEPBALANCE::init (const Matrix& a, const std::string& balance_job) |
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51 { |
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52 int n = a.cols (); |
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53 |
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54 if (a.rows () != n) |
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55 { |
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56 (*current_liboctave_error_handler) ("AEPBALANCE requires square matrix"); |
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57 return -1; |
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58 } |
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59 |
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60 int info; |
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61 int ilo; |
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62 int ihi; |
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63 |
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64 Array<double> scale (n); |
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65 double *pscale = scale.fortran_vec (); |
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66 |
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67 balanced_mat = a; |
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68 double *p_balanced_mat = balanced_mat.fortran_vec (); |
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69 |
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70 char job = balance_job[0]; |
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71 |
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72 F77_XFCN (dgebal, DGEBAL, (F77_CONST_CHAR_ARG2 (&job, 1), |
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73 n, p_balanced_mat, n, ilo, ihi, pscale, info |
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74 F77_CHAR_ARG_LEN (1))); |
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75 |
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76 if (f77_exception_encountered) |
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77 (*current_liboctave_error_handler) ("unrecoverable error in dgebal"); |
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78 else |
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79 { |
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80 balancing_mat = Matrix (n, n, 0.0); |
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81 for (int i = 0; i < n; i++) |
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82 balancing_mat.elem (i ,i) = 1.0; |
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83 |
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84 double *p_balancing_mat = balancing_mat.fortran_vec (); |
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85 |
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86 char side = 'R'; |
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87 |
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88 F77_XFCN (dgebak, DGEBAK, (F77_CONST_CHAR_ARG2 (&job, 1), |
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89 F77_CONST_CHAR_ARG2 (&side, 1), |
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90 n, ilo, ihi, pscale, n, |
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91 p_balancing_mat, n, info |
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92 F77_CHAR_ARG_LEN (1) |
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93 F77_CHAR_ARG_LEN (1))); |
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94 |
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95 if (f77_exception_encountered) |
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96 (*current_liboctave_error_handler) ("unrecoverable error in dgebak"); |
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97 } |
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98 |
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99 return info; |
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100 } |
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101 |
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102 /* |
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103 ;;; Local Variables: *** |
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104 ;;; mode: C++ *** |
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105 ;;; End: *** |
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106 */ |
