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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, 675 Mass Ave, Cambridge, MA 02139, 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 "CmplxLU.h" |
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29 #include "mx-inlines.cc" |
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30 #include "lo-error.h" |
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31 #include "f77-uscore.h" |
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32 |
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33 extern "C" |
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34 { |
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35 int F77_FCN (zgesv) (const int&, const int&, Complex*, const int&, |
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36 int*, Complex*, const int&, int&); |
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37 } |
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38 |
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39 ComplexLU::ComplexLU (const ComplexMatrix& a) |
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40 { |
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41 int a_nr = a.rows (); |
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42 int a_nc = a.cols (); |
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43 if (a_nr == 0 || a_nc == 0 || a_nr != a_nc) |
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44 { |
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45 (*current_liboctave_error_handler) ("ComplexLU requires square matrix"); |
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46 return; |
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47 } |
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48 |
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49 int n = a_nr; |
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50 |
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51 int *ipvt = new int [n]; |
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52 int *pvt = new int [n]; |
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53 Complex *tmp_data = dup (a.data (), a.length ()); |
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54 int info = 0; |
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55 Complex *b; |
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56 |
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57 F77_FCN (zgesv) (n, 0, tmp_data, n, ipvt, b, n, info); |
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58 |
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59 ComplexMatrix A_fact (tmp_data, n, n); |
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60 |
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61 int i; |
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62 |
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63 for (i = 0; i < n; i++) |
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64 { |
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65 ipvt[i] -= 1; |
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66 pvt[i] = i; |
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67 } |
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68 |
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69 for (i = 0; i < n - 1; i++) |
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70 { |
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71 int k = ipvt[i]; |
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72 if (k != i) |
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73 { |
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74 int tmp = pvt[k]; |
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75 pvt[k] = pvt[i]; |
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76 pvt[i] = tmp; |
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77 } |
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78 } |
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79 |
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80 l.resize (n, n, 0.0); |
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81 u.resize (n, n, 0.0); |
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82 p.resize (n, n, 0.0); |
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83 |
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84 for (i = 0; i < n; i++) |
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85 { |
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86 p.elem (i, pvt[i]) = 1.0; |
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87 |
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88 int j; |
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89 |
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90 l.elem (i, i) = 1.0; |
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91 for (j = 0; j < i; j++) |
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92 l.elem (i, j) = A_fact.elem (i, j); |
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93 |
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94 for (j = i; j < n; j++) |
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95 u.elem (i, j) = A_fact.elem (i, j); |
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96 } |
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97 |
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98 delete [] ipvt; |
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99 delete [] pvt; |
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100 } |
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101 |
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102 /* |
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103 ;;; Local Variables: *** |
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104 ;;; mode: C++ *** |
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105 ;;; page-delimiter: "^/\\*" *** |
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106 ;;; End: *** |
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107 */ |
