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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 (NO_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 "dbleCHOL.h" |
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32 #include "f77-fcn.h" |
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33 #include "lo-error.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_FUNC (dpotrf, DPOTRF) (const char*, const int&, double*, |
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38 const int&, int&, long); |
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39 } |
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40 |
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41 int |
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42 CHOL::init (const Matrix& a) |
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43 { |
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44 int a_nr = a.rows (); |
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45 int a_nc = a.cols (); |
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46 |
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47 if (a_nr != a_nc) |
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48 { |
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49 (*current_liboctave_error_handler) ("CHOL requires square matrix"); |
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50 return -1; |
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51 } |
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52 |
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53 int n = a_nc; |
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54 int info; |
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55 |
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56 chol_mat = a; |
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57 double *h = chol_mat.fortran_vec (); |
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58 |
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59 F77_XFCN (dpotrf, DPOTRF, ("U", n, h, n, info, 1L)); |
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60 |
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61 if (f77_exception_encountered) |
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62 (*current_liboctave_error_handler) ("unrecoverable error in dpotrf"); |
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63 else |
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64 { |
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65 // If someone thinks of a more graceful way of doing this (or |
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66 // faster for that matter :-)), please let me know! |
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67 |
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68 if (n > 1) |
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69 for (int j = 0; j < a_nc; j++) |
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70 for (int i = j+1; i < a_nr; i++) |
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71 chol_mat.elem (i, j) = 0.0; |
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72 } |
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73 |
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74 return info; |
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75 } |
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76 |
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77 /* |
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78 ;;; Local Variables: *** |
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79 ;;; mode: C++ *** |
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80 ;;; End: *** |
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81 */ |
