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annotate liboctave/PermMatrix.cc @ 8500:aaddb450b9aa

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[docs] can not => cannot
author Brian Gough <bjg@gnu.org>
date Tue, 13 Jan 2009 00:36:52 -0500
parents e3c9102431a9
children 937921654627
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1 /*
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2
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3 Copyright (C) 2008 Jaroslav Hajek
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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 "PermMatrix.h"
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28 #include "idx-vector.h"
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29 #include "error.h"
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30 #include "Array-util.h"
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31
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32 static void
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33 gripe_invalid_permutation (void)
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34 {
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35 (*current_liboctave_error_handler)
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36 ("PermMatrix: invalid permutation vector");
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37 }
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38
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39 PermMatrix::PermMatrix (const Array<octave_idx_type>& p, bool colp, bool check)
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40 : Array<octave_idx_type> (p), _colp(colp)
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41 {
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42 this->dimensions = dim_vector (p.length (), p.length ());
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43 if (check)
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44 {
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45 if (! idx_vector (p).is_permutation (p.length ()))
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46 {
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47 gripe_invalid_permutation ();
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48 Array<octave_idx_type>::operator = (Array<octave_idx_type> ());
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49 }
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50 }
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51 }
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52
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53 PermMatrix::PermMatrix (const idx_vector& idx, bool colp, octave_idx_type n)
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54 : Array<octave_idx_type> (), _colp(colp)
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55 {
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56 octave_idx_type len = idx.length (n);
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57 if (! idx.is_permutation (len))
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58 gripe_invalid_permutation ();
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59 else
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60 {
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61 Array<octave_idx_type> idxa (len);
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62 for (octave_idx_type i = 0; i < len; i++) idxa(i) = idx(i);
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63 Array<octave_idx_type>::operator = (idxa);
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64 this->dimensions = dim_vector (len, len);
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65 }
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66 }
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67
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68 PermMatrix::PermMatrix (octave_idx_type n)
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69 : Array<octave_idx_type> (n), _colp (false)
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70 {
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71 this->dimensions = dim_vector (n, n);
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72 for (octave_idx_type i = 0; i < n; i++) xelem (i) = i;
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73 }
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74
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75 octave_idx_type
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76 PermMatrix::checkelem (octave_idx_type i, octave_idx_type j) const
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77 {
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78 octave_idx_type len = Array<octave_idx_type>::length ();
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79 if (i < 0 || j < 0 || i > len || j > len)
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80 {
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81 (*current_liboctave_error_handler) ("index out of range");
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82 return 0;
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83 }
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84 else
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85 return elem (i, j);
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86 }
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87
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88
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89 PermMatrix
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90 PermMatrix::transpose (void) const
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91 {
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92 PermMatrix retval (*this);
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93 retval._colp = ! retval._colp;
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94 return retval;
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95 }
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96
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97 PermMatrix
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98 PermMatrix::inverse (void) const
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99 {
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100 return transpose ();
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101 }
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102
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103 octave_idx_type
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104 PermMatrix::determinant (void) const
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105 {
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106 Array<octave_idx_type> pa = *this;
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107 octave_idx_type len = pa.length (), *p = pa.fortran_vec ();
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108 bool neg = false;
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109 for (octave_idx_type i = 0; i < len; i++)
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110 {
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111 octave_idx_type j = p[i];
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112 if (j != i)
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113 {
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114 p[i] = p[j];
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115 p[j] = j;
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116 neg = ! neg;
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117 }
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118 }
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119
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120 return neg ? -1 : 1;
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121 }
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122
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123 PermMatrix
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124 operator *(const PermMatrix& a, const PermMatrix& b)
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125 {
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126 const Array<octave_idx_type> ia = a.pvec (), ib = b.pvec ();
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127 PermMatrix r;
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128 octave_idx_type n = a.columns ();
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129 if (n != b.rows ())
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130 gripe_nonconformant ("operator *", n, n, b.rows (), b.rows ());
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131 else if (a._colp == b._colp)
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132 {
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133 r = PermMatrix ((a._colp
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134 ? ia.index (idx_vector (ib))
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135 : ib.index (idx_vector (ia))), a._colp, false);
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136 }
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137 else
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138 {
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139 Array<octave_idx_type> ra (n);
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140 if (a._colp)
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141 ra.assign (idx_vector (ib), ia);
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142 else
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143 ra.assign (idx_vector (ia), ib);
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144 r = PermMatrix (ra, a._colp, false);
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145 }
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146
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147 return r;
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148 }