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1 // -*- C++ -*- |
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2 /* |
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3 |
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4 Copyright (C) 1992, 1993, 1994, 1995 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 2, or (at your option) any |
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11 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, write to the Free |
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20 Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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21 |
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22 */ |
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23 |
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24 #if defined (__GNUG__) |
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25 #pragma implementation |
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26 #endif |
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27 |
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28 #ifdef HAVE_CONFIG_H |
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29 #include <config.h> |
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30 #endif |
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31 |
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32 #include "dbleAEPBAL.h" |
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33 #include "f77-uscore.h" |
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34 |
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35 extern "C" |
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36 { |
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37 int F77_FCN (dgebal, DGEBAL) (const char*, const int&, double*, |
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38 const int&, int&, int&, double*, |
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39 int&, long, long); |
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40 |
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41 int F77_FCN (dgebak, DGEBAK) (const char*, const char*, const int&, |
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42 const int&, const int&, double*, |
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43 const int&, double*, const int&, |
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44 int&, long, long); |
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45 } |
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46 |
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47 int |
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48 AEPBALANCE::init (const Matrix& a, const char *balance_job) |
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49 { |
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50 int a_nc = a.cols (); |
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51 if (a.rows () != a_nc) |
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52 { |
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53 (*current_liboctave_error_handler) ("AEPBALANCE requires square matrix"); |
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54 return -1; |
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55 } |
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56 |
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57 int n = a_nc; |
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58 |
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59 // Parameters for balance call. |
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60 |
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61 int info; |
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62 int ilo; |
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63 int ihi; |
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64 double *scale = new double [n]; |
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65 |
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66 // Copy matrix into local structure. |
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67 |
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68 balanced_mat = a; |
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69 |
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70 F77_FCN (dgebal, DGEBAL) (balance_job, n, |
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71 balanced_mat.fortran_vec (), n, ilo, ihi, |
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72 scale, info, 1L, 1L); |
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73 |
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74 // Initialize balancing matrix to identity. |
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75 |
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76 balancing_mat = Matrix (n, n, 0.0); |
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77 for (int i = 0; i < n; i++) |
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78 balancing_mat.elem (i ,i) = 1.0; |
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79 |
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80 F77_FCN (dgebak, DGEBAK) (balance_job, "R", n, ilo, ihi, scale, n, |
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81 balancing_mat.fortran_vec (), n, info, 1L, |
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82 1L); |
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83 |
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84 delete [] scale; |
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85 |
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86 return info; |
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87 } |
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88 |
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89 /* |
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90 ;;; Local Variables: *** |
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91 ;;; mode: C++ *** |
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92 ;;; page-delimiter: "^/\\*" *** |
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93 ;;; End: *** |
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94 */ |
