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annotate liboctave/base-lu.cc @ 10350:12884915a8e4

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merge MArray classes & improve Array interface
author Jaroslav Hajek <highegg@gmail.com>
date Sat, 23 Jan 2010 21:41:03 +0100
parents 4c0cdbe0acca
children 4d1fc073fbb7
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1 /*
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2
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John W. Eaton <jwe@octave.org>
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3 Copyright (C) 1996, 1997, 2002, 2003, 2004, 2005, 2007, 2008 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 3 of the License, or (at your
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10 option) any 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, see
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19 <http://www.gnu.org/licenses/>.
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20
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21 */
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22
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23 #ifdef HAVE_CONFIG_H
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24 #include <config.h>
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25 #endif
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26
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27 #include "base-lu.h"
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28
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29 template <class lu_type>
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30 base_lu<lu_type>::base_lu (const lu_type& l, const lu_type& u,
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31 const PermMatrix& p)
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32 : a_fact (u), l_fact (l), ipvt (p.pvec ())
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33 {
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34 if (l.columns () != u.rows ())
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35 (*current_liboctave_error_handler) ("lu: dimension mismatch");
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36 }
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37
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38 template <class lu_type>
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39 bool
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40 base_lu <lu_type> :: packed (void) const
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41 {
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42 return l_fact.dims () == dim_vector ();
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43 }
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44
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45 template <class lu_type>
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46 void
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47 base_lu <lu_type> :: unpack (void)
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48 {
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49 if (packed ())
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50 {
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51 l_fact = L ();
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52 a_fact = U (); // FIXME: sub-optimal
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53 ipvt = getp ();
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54 }
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55 }
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56
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57 template <class lu_type>
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58 lu_type
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59 base_lu <lu_type> :: L (void) const
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60 {
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61 if (packed ())
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62 {
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63 octave_idx_type a_nr = a_fact.rows ();
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64 octave_idx_type a_nc = a_fact.cols ();
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65 octave_idx_type mn = (a_nr < a_nc ? a_nr : a_nc);
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66
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67 lu_type l (a_nr, mn, lu_elt_type (0.0));
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68
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69 for (octave_idx_type i = 0; i < a_nr; i++)
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70 {
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71 if (i < a_nc)
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72 l.xelem (i, i) = 1.0;
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73
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74 for (octave_idx_type j = 0; j < (i < a_nc ? i : a_nc); j++)
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75 l.xelem (i, j) = a_fact.xelem (i, j);
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76 }
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77
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78 return l;
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79 }
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80 else
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81 return l_fact;
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82 }
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83
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84 template <class lu_type>
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85 lu_type
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86 base_lu <lu_type> :: U (void) const
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87 {
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88 if (packed ())
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89 {
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90 octave_idx_type a_nr = a_fact.rows ();
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91 octave_idx_type a_nc = a_fact.cols ();
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92 octave_idx_type mn = (a_nr < a_nc ? a_nr : a_nc);
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93
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94 lu_type u (mn, a_nc, lu_elt_type (0.0));
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95
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96 for (octave_idx_type i = 0; i < mn; i++)
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97 {
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98 for (octave_idx_type j = i; j < a_nc; j++)
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99 u.xelem (i, j) = a_fact.xelem (i, j);
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100 }
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101
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102 return u;
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103 }
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104 else
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105 return a_fact;
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106 }
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107
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108 template <class lu_type>
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109 lu_type
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110 base_lu <lu_type> :: Y (void) const
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111 {
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112 if (! packed ())
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113 (*current_liboctave_error_handler) ("lu: Y() not implemented for unpacked form.");
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114 return a_fact;
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115 }
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116
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117 template <class lu_type>
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118 Array<octave_idx_type>
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119 base_lu <lu_type> :: getp (void) const
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120 {
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121 if (packed ())
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122 {
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123 octave_idx_type a_nr = a_fact.rows ();
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124
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125 Array<octave_idx_type> pvt (a_nr, 1);
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126
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127 for (octave_idx_type i = 0; i < a_nr; i++)
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128 pvt.xelem (i) = i;
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129
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130 for (octave_idx_type i = 0; i < ipvt.length(); i++)
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131 {
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132 octave_idx_type k = ipvt.xelem (i);
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133
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134 if (k != i)
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135 {
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136 octave_idx_type tmp = pvt.xelem (k);
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137 pvt.xelem (k) = pvt.xelem (i);
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138 pvt.xelem (i) = tmp;
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139 }
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140 }
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141
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142 return pvt;
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143 }
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144 else
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145 return ipvt;
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146 }
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147
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148 template <class lu_type>
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149 PermMatrix
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150 base_lu <lu_type> :: P (void) const
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151 {
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152 return PermMatrix (getp (), false);
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153 }
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154
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155 template <class lu_type>
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156 ColumnVector
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157 base_lu <lu_type> :: P_vec (void) const
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158 {
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159 octave_idx_type a_nr = a_fact.rows ();
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160
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161 ColumnVector p (a_nr);
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162
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163 Array<octave_idx_type> pvt = getp ();
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164
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165 for (octave_idx_type i = 0; i < a_nr; i++)
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166 p.xelem (i) = static_cast<double> (pvt.xelem (i) + 1);
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167
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168 return p;
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169 }
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170
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171 template <class lu_type>
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172 bool
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173 base_lu<lu_type>::regular (void) const
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174 {
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175 octave_idx_type k = std::min (a_fact.rows (), a_fact.columns ());
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176 bool retval = true;
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177 for (octave_idx_type i = 0; i < k; i++)
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178 if (a_fact(i, i) == lu_elt_type ())
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179 {
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180 retval = false;
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181 break;
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182 }
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183
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184 return true;
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185 }