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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 "base-lu.h" |
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32 |
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33 template <class lu_type, class lu_elt_type, class p_type, class p_elt_type> |
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34 lu_type |
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35 base_lu <lu_type, lu_elt_type, p_type, p_elt_type> :: L (void) const |
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36 { |
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37 int a_nr = a_fact.rows (); |
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38 int a_nc = a_fact.cols (); |
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39 int mn = (a_nr < a_nc ? a_nr : a_nc); |
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40 |
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41 lu_type l (a_nr, mn, lu_elt_type (0.0)); |
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42 |
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43 for (int i = 0; i < a_nr; i++) |
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44 { |
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45 if (i < a_nc) |
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46 l.xelem (i, i) = 1.0; |
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47 |
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48 for (int j = 0; j < (i < a_nc ? i : a_nc); j++) |
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49 l.xelem (i, j) = a_fact.xelem (i, j); |
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50 } |
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51 |
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52 return l; |
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53 } |
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54 |
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55 template <class lu_type, class lu_elt_type, class p_type, class p_elt_type> |
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56 lu_type |
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57 base_lu <lu_type, lu_elt_type, p_type, p_elt_type> :: U (void) const |
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58 { |
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59 int a_nr = a_fact.rows (); |
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60 int a_nc = a_fact.cols (); |
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61 int mn = (a_nr < a_nc ? a_nr : a_nc); |
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62 |
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63 lu_type u (mn, a_nc, lu_elt_type (0.0)); |
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64 |
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65 for (int i = 0; i < mn; i++) |
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66 { |
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67 for (int j = i; j < a_nc; j++) |
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68 u.xelem (i, j) = a_fact.xelem (i, j); |
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69 } |
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70 |
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71 return u; |
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72 } |
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73 |
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74 template <class lu_type, class lu_elt_type, class p_type, class p_elt_type> |
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75 p_type |
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76 base_lu <lu_type, lu_elt_type, p_type, p_elt_type> :: P (void) const |
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77 { |
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78 int a_nr = a_fact.rows (); |
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79 |
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80 Array<int> pvt (a_nr); |
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81 |
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82 for (int i = 0; i < a_nr; i++) |
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83 pvt.xelem (i) = i; |
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84 |
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85 for (int i = 0; i < ipvt.length(); i++) |
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86 { |
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87 int k = ipvt.xelem (i); |
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88 |
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89 if (k != i) |
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90 { |
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91 int tmp = pvt.xelem (k); |
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92 pvt.xelem (k) = pvt.xelem (i); |
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93 pvt.xelem (i) = tmp; |
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94 } |
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95 } |
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96 |
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97 p_type p (a_nr, a_nr, p_elt_type (0.0)); |
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98 |
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99 for (int i = 0; i < a_nr; i++) |
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100 p.xelem (i, pvt.xelem (i)) = 1.0; |
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101 |
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102 return p; |
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103 } |
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104 |
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105 /* |
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106 ;;; Local Variables: *** |
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107 ;;; mode: C++ *** |
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108 ;;; End: *** |
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109 */ |
