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1 // -*- C++ -*- |
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2 /* |
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3 |
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4 Copyright (C) 1996 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 "dbleCHOL.h" |
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33 #include "f77-fcn.h" |
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34 #include "lo-error.h" |
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35 #include "mx-inlines.cc" |
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36 |
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37 extern "C" |
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38 { |
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39 int F77_FCN (dpotrf, DPOTRF) (const char*, const int&, double*, |
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40 const int&, int&, long); |
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41 } |
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42 |
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43 int |
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44 CHOL::init (const Matrix& a) |
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45 { |
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46 int a_nr = a.rows (); |
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47 int a_nc = a.cols (); |
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48 |
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49 if (a_nr != a_nc) |
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50 { |
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51 (*current_liboctave_error_handler) ("CHOL requires square matrix"); |
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52 return -1; |
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53 } |
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54 |
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55 int n = a_nc; |
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56 int info; |
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57 |
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58 chol_mat = a; |
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59 double *h = chol_mat.fortran_vec (); |
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60 |
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61 F77_XFCN (dpotrf, DPOTRF, ("U", n, h, n, info, 1L)); |
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62 |
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63 if (f77_exception_encountered) |
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64 (*current_liboctave_error_handler) ("unrecoverable error in dpotrf"); |
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65 else |
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66 { |
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67 // If someone thinks of a more graceful way of doing this (or |
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68 // faster for that matter :-)), please let me know! |
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69 |
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70 if (n > 1) |
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71 for (int j = 0; j < a_nc; j++) |
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72 for (int i = j+1; i < a_nr; i++) |
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73 chol_mat.elem (i, j) = 0.0; |
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74 } |
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75 |
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76 return info; |
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77 } |
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78 |
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79 /* |
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80 ;;; Local Variables: *** |
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81 ;;; mode: C++ *** |
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82 ;;; page-delimiter: "^/\\*" *** |
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83 ;;; End: *** |
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84 */ |
