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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 #if defined (__GNUG__) && defined (USE_PRAGMA_INTERFACE_IMPLEMENTATION) |
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24 #pragma implementation |
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25 #endif |
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26 |
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27 #ifdef HAVE_CONFIG_H |
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28 #include <config.h> |
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29 #endif |
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30 |
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31 #include <string> |
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32 |
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33 #include "dbleAEPBAL.h" |
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34 #include "f77-fcn.h" |
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35 |
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36 extern "C" |
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37 { |
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38 int F77_FUNC (dgebal, DGEBAL) (const char*, const int&, double*, |
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39 const int&, int&, int&, double*, |
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40 int&, long, long); |
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41 |
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42 int F77_FUNC (dgebak, DGEBAK) (const char*, const char*, const int&, |
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43 const int&, const int&, double*, |
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44 const int&, double*, const int&, |
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45 int&, long, long); |
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46 } |
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47 |
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48 int |
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49 AEPBALANCE::init (const Matrix& a, const std::string& balance_job) |
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50 { |
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51 int n = a.cols (); |
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52 |
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53 if (a.rows () != n) |
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54 { |
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55 (*current_liboctave_error_handler) ("AEPBALANCE requires square matrix"); |
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56 return -1; |
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57 } |
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58 |
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59 int info; |
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60 int ilo; |
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61 int ihi; |
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62 |
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63 Array<double> scale (n); |
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64 double *pscale = scale.fortran_vec (); |
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65 |
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66 balanced_mat = a; |
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67 double *p_balanced_mat = balanced_mat.fortran_vec (); |
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68 |
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69 char job = balance_job[0]; |
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70 |
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71 F77_XFCN (dgebal, DGEBAL, (&job, n, p_balanced_mat, n, ilo, ihi, |
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72 pscale, info, 1L, 1L)); |
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73 |
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74 if (f77_exception_encountered) |
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75 (*current_liboctave_error_handler) ("unrecoverable error in dgebal"); |
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76 else |
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77 { |
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78 balancing_mat = Matrix (n, n, 0.0); |
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79 for (int i = 0; i < n; i++) |
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80 balancing_mat.elem (i ,i) = 1.0; |
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81 |
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82 double *p_balancing_mat = balancing_mat.fortran_vec (); |
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83 |
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84 char side = 'R'; |
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85 |
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86 F77_XFCN (dgebak, DGEBAK, (&job, &side, n, ilo, ihi, pscale, n, |
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87 p_balancing_mat, n, info, 1L, 1L)); |
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88 |
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89 if (f77_exception_encountered) |
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90 (*current_liboctave_error_handler) ("unrecoverable error in dgebak"); |
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91 } |
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92 |
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93 return info; |
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94 } |
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95 |
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96 /* |
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97 ;;; Local Variables: *** |
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98 ;;; mode: C++ *** |
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99 ;;; End: *** |
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100 */ |
