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1 /* |
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2 |
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3 Copyright (C) 1996 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__) |
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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 "base-lu.h" |
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32 |
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33 template <class lu_type, class p_type> |
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34 lu_type |
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35 base_lu <lu_type, p_type> :: L (void) const |
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36 { |
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37 int n = ipvt.length (); |
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38 |
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39 lu_type l (n, n, 0.0); |
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40 |
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41 for (int i = 0; i < n; i++) |
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42 { |
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43 l.xelem (i, i) = 1.0; |
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44 for (int j = 0; j < i; j++) |
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45 l.xelem (i, j) = a_fact.xelem (i, j); |
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46 } |
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47 |
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48 return l; |
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49 } |
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50 |
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51 template <class lu_type, class p_type> |
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52 lu_type |
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53 base_lu <lu_type, p_type> :: U (void) const |
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54 { |
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55 int n = ipvt.length (); |
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56 |
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57 lu_type u (n, n, 0.0); |
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58 |
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59 for (int i = 0; i < n; i++) |
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60 { |
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61 for (int j = i; j < n; j++) |
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62 u.xelem (i, j) = a_fact.xelem (i, j); |
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63 } |
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64 |
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65 return u; |
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66 } |
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67 |
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68 template <class lu_type, class p_type> |
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69 p_type |
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70 base_lu <lu_type, p_type> :: P (void) const |
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71 { |
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72 int n = ipvt.length (); |
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73 |
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74 Array<int> pvt (n); |
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75 |
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76 for (int i = 0; i < n; i++) |
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77 pvt.xelem (i) = i; |
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78 |
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79 for (int i = 0; i < n - 1; i++) |
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80 { |
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81 int k = ipvt.xelem (i); |
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82 |
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83 if (k != i) |
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84 { |
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85 int tmp = pvt.xelem (k); |
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86 pvt.xelem (k) = pvt.xelem (i); |
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87 pvt.xelem (i) = tmp; |
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88 } |
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89 } |
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90 |
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91 p_type p (n, n, 0.0); |
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92 |
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93 for (int i = 0; i < n; i++) |
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94 p.xelem (i, pvt.xelem (i)) = 1.0; |
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95 |
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96 return p; |
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97 } |
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98 |
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99 /* |
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100 ;;; Local Variables: *** |
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101 ;;; mode: C++ *** |
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102 ;;; End: *** |
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103 */ |
