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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, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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20 02110-1301, USA. |
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21 |
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22 */ |
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23 |
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24 #ifdef HAVE_CONFIG_H |
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25 #include <config.h> |
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26 #endif |
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27 |
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28 #include "dbleCHOL.h" |
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29 #include "f77-fcn.h" |
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30 #include "lo-error.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 (dpotrf, DPOTRF) (F77_CONST_CHAR_ARG_DECL, const octave_idx_type&, |
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36 double*, const octave_idx_type&, octave_idx_type& |
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37 F77_CHAR_ARG_LEN_DECL); |
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38 } |
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39 |
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40 octave_idx_type |
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41 CHOL::init (const Matrix& a) |
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42 { |
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43 octave_idx_type a_nr = a.rows (); |
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44 octave_idx_type a_nc = a.cols (); |
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45 |
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46 if (a_nr != a_nc) |
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47 { |
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48 (*current_liboctave_error_handler) ("CHOL requires square matrix"); |
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49 return -1; |
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50 } |
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51 |
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52 octave_idx_type n = a_nc; |
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53 octave_idx_type info; |
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54 |
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55 chol_mat = a; |
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56 double *h = chol_mat.fortran_vec (); |
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57 |
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58 F77_XFCN (dpotrf, DPOTRF, (F77_CONST_CHAR_ARG2 ("U", 1), |
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59 n, h, n, info |
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60 F77_CHAR_ARG_LEN (1))); |
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61 |
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62 if (f77_exception_encountered) |
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63 (*current_liboctave_error_handler) ("unrecoverable error in dpotrf"); |
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64 else |
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65 { |
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66 // If someone thinks of a more graceful way of doing this (or |
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67 // faster for that matter :-)), please let me know! |
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68 |
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69 if (n > 1) |
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70 for (octave_idx_type j = 0; j < a_nc; j++) |
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71 for (octave_idx_type i = j+1; i < a_nr; i++) |
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72 chol_mat.elem (i, j) = 0.0; |
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73 } |
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74 |
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75 return info; |
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76 } |
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77 |
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78 /* |
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79 ;;; Local Variables: *** |
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80 ;;; mode: C++ *** |
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81 ;;; End: *** |
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82 */ |
