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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 "CmplxCHOL.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 F77_RET_T |
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38 F77_FUNC (zpotrf, ZPOTRF) (F77_CONST_CHAR_ARG_DECL, |
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39 const int&, Complex*, const int&, int& |
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40 F77_CHAR_ARG_LEN_DECL); |
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41 } |
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42 |
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43 int |
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44 ComplexCHOL::init (const ComplexMatrix& 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) |
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52 ("ComplexCHOL requires square matrix"); |
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53 return -1; |
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54 } |
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55 |
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56 int n = a_nc; |
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57 int info; |
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58 |
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59 chol_mat = a; |
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60 Complex *h = chol_mat.fortran_vec (); |
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61 |
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62 F77_XFCN (zpotrf, ZPOTRF, (F77_CONST_CHAR_ARG2 ("U", 1), n, h, n, info |
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63 F77_CHAR_ARG_LEN (1))); |
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64 |
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65 if (f77_exception_encountered) |
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66 (*current_liboctave_error_handler) ("unrecoverable error in zpotrf"); |
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67 else |
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68 { |
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69 // If someone thinks of a more graceful way of doing this (or |
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70 // faster for that matter :-)), please let me know! |
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71 |
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72 if (n > 1) |
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73 for (int j = 0; j < a_nc; j++) |
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74 for (int i = j+1; i < a_nr; i++) |
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75 chol_mat.elem (i, j) = 0.0; |
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76 } |
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77 |
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78 return info; |
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79 } |
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80 |
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81 /* |
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82 ;;; Local Variables: *** |
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83 ;;; mode: C++ *** |
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84 ;;; End: *** |
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85 */ |
