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annotate liboctave/operators/Sparse-perm-op-defs.h @ 20782:1b62fc4e1b2f stable

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doc: Cuddle parentheses in example code of for loop. * stmt.txi: Cuddle parentheses in example code of for loop.
author Rik <rik@octave.org>
date Wed, 07 Oct 2015 14:41:39 -0700
parents 4197fc428c7d
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /* -*- C++ -*-
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2
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3 Copyright (C) 2009-2015 Jason Riedy
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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 #if !defined (octave_Sparse_perm_op_defs_h)
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24 #define octave_Sparse_perm_op_defs_h 1
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25
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26 // Matrix multiplication
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27
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28 template <typename SM>
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29 SM octinternal_do_mul_colpm_sm (const octave_idx_type *pcol, const SM& a)
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30 // Relabel the rows according to pcol.
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31 {
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32 const octave_idx_type nr = a.rows ();
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33 const octave_idx_type nc = a.cols ();
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34 const octave_idx_type nent = a.nnz ();
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35 SM r (nr, nc, nent);
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36
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37 octave_sort<octave_idx_type> sort;
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38
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39 for (octave_idx_type j = 0; j <= nc; ++j)
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40 r.xcidx (j) = a.cidx (j);
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41
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42 for (octave_idx_type j = 0; j < nc; j++)
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43 {
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44 octave_quit ();
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45
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46 OCTAVE_LOCAL_BUFFER (octave_idx_type, sidx, r.xcidx (j+1) - r.xcidx (j));
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47 for (octave_idx_type i = r.xcidx (j), ii = 0; i < r.xcidx (j+1); i++)
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48 {
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49 sidx[ii++]=i;
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50 r.xridx (i) = pcol[a.ridx (i)];
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51 }
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52 sort.sort (r.xridx () + r.xcidx (j), sidx, r.xcidx (j+1) - r.xcidx (j));
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53 for (octave_idx_type i = r.xcidx (j), ii = 0; i < r.xcidx (j+1); i++)
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54 r.xdata (i) = a.data (sidx[ii++]);
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55 }
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56
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57 return r;
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58 }
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59
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60 template <typename SM>
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61 SM octinternal_do_mul_pm_sm (const PermMatrix& p, const SM& a)
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62 {
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63 const octave_idx_type nr = a.rows ();
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64 if (p.cols () != nr)
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65 {
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66 gripe_nonconformant ("operator *", p.rows (), p.cols (), a.rows (), a.cols ());
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67 return SM ();
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68 }
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69
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70 return octinternal_do_mul_colpm_sm (p.col_perm_vec ().data (), a);
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71 }
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72
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73 template <typename SM>
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74 SM octinternal_do_mul_sm_rowpm (const SM& a, const octave_idx_type *prow)
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75 // For a row permutation, iterate across the source a and stuff the
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76 // results into the correct destination column in r.
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77 {
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78 const octave_idx_type nr = a.rows ();
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79 const octave_idx_type nc = a.cols ();
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80 const octave_idx_type nent = a.nnz ();
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81 SM r (nr, nc, nent);
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82
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83 for (octave_idx_type j_src = 0; j_src < nc; ++j_src)
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84 r.xcidx (prow[j_src]) = a.cidx (j_src+1) - a.cidx (j_src);
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85 octave_idx_type k = 0;
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86 for (octave_idx_type j = 0; j < nc; ++j)
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87 {
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88 const octave_idx_type tmp = r.xcidx (j);
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89 r.xcidx (j) = k;
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90 k += tmp;
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91 }
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92 r.xcidx (nc) = nent;
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93
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94 octave_idx_type k_src = 0;
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95 for (octave_idx_type j_src = 0; j_src < nc; ++j_src)
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96 {
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97 octave_quit ();
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98 const octave_idx_type j = prow[j_src];
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99 const octave_idx_type kend_src = a.cidx (j_src + 1);
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100 for (k = r.xcidx (j); k_src < kend_src; ++k, ++k_src)
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101 {
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102 r.xridx (k) = a.ridx (k_src);
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103 r.xdata (k) = a.data (k_src);
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104 }
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105 }
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106 assert (k_src == nent);
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107
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108 return r;
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109 }
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110
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111 template <typename SM>
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112 SM octinternal_do_mul_sm_colpm (const SM& a, const octave_idx_type *pcol)
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113 // For a column permutation, iterate across the destination r and pull
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114 // data from the correct column of a.
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115 {
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116 const octave_idx_type nr = a.rows ();
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117 const octave_idx_type nc = a.cols ();
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118 const octave_idx_type nent = a.nnz ();
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119 SM r (nr, nc, nent);
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120
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121 for (octave_idx_type j = 0; j < nc; ++j)
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122 {
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123 const octave_idx_type j_src = pcol[j];
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124 r.xcidx (j+1) = r.xcidx (j) + (a.cidx (j_src+1) - a.cidx (j_src));
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125 }
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126 assert (r.xcidx (nc) == nent);
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127
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128 octave_idx_type k = 0;
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129 for (octave_idx_type j = 0; j < nc; ++j)
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130 {
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131 octave_quit ();
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132 const octave_idx_type j_src = pcol[j];
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133 octave_idx_type k_src;
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134 const octave_idx_type kend_src = a.cidx (j_src + 1);
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135 for (k_src = a.cidx (j_src); k_src < kend_src; ++k_src, ++k)
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136 {
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137 r.xridx (k) = a.ridx (k_src);
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138 r.xdata (k) = a.data (k_src);
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139 }
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140 }
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141 assert (k == nent);
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142
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143 return r;
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144 }
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145
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146 template <typename SM>
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147 SM octinternal_do_mul_sm_pm (const SM& a, const PermMatrix& p)
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148 {
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149 const octave_idx_type nc = a.cols ();
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150 if (p.rows () != nc)
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151 {
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152 gripe_nonconformant ("operator *", a.rows (), a.cols (), p.rows (), p.cols ());
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153 return SM ();
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154 }
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155
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156 return octinternal_do_mul_sm_colpm (a, p.col_perm_vec ().data ());
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157 }
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158
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159 #endif // octave_Sparse_perm_op_defs_h