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annotate libinterp/corefcn/amd.cc @ 33617:ec2635a02328 bytecode-interpreter tip

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maint: Merge default to bytecode-interpreter.
author Markus Mützel <markus.muetzel@gmx.de>
date Tue, 21 May 2024 18:29:03 +0200
parents f53ac65ffba6
children
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1 ////////////////////////////////////////////////////////////////////////
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2 //
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3 // Copyright (C) 2008-2024 The Octave Project Developers
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4 //
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5 // See the file COPYRIGHT.md in the top-level directory of this
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6 // distribution or <https://octave.org/copyright/>.
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7 //
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8 // This file is part of Octave.
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9 //
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10 // Octave is free software: you can redistribute it and/or modify it
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11 // under the terms of the GNU General Public License as published by
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12 // the Free Software Foundation, either version 3 of the License, or
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13 // (at your option) any later version.
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14 //
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15 // Octave is distributed in the hope that it will be useful, but
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16 // WITHOUT ANY WARRANTY; without even the implied warranty of
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17 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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18 // GNU General Public License for more details.
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19 //
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20 // You should have received a copy of the GNU General Public License
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21 // along with Octave; see the file COPYING. If not, see
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22 // <https://www.gnu.org/licenses/>.
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23 //
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24 ////////////////////////////////////////////////////////////////////////
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25
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26 // This is the octave interface to amd, which bore the copyright given
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27 // in the help of the functions.
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28
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29 #if defined (HAVE_CONFIG_H)
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30 # include "config.h"
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31 #endif
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32
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33 #include <cstdlib>
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34
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35 #include "CSparse.h"
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36 #include "Sparse.h"
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37 #include "dMatrix.h"
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38 #include "oct-locbuf.h"
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39 #include "oct-sparse.h"
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40
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41 #include "defun.h"
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42 #include "error.h"
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43 #include "errwarn.h"
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44 #include "oct-map.h"
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45 #include "ov.h"
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46 #include "ovl.h"
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47 #include "parse.h"
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48
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49 OCTAVE_BEGIN_NAMESPACE(octave)
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50
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51 DEFUN (amd, args, nargout,
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52 doc: /* -*- texinfo -*-
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53 @deftypefn {} {@var{p} =} amd (@var{S})
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54 @deftypefnx {} {@var{p} =} amd (@var{S}, @var{opts})
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55
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56 Return the approximate minimum degree permutation of a matrix.
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57
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58 This is a permutation such that the Cholesky@tie{}factorization of
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59 @code{@var{S} (@var{p}, @var{p})} tends to be sparser than the
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60 Cholesky@tie{}factorization of @var{S} itself. @code{amd} is typically
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61 faster than @code{symamd} but serves a similar purpose.
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62
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63 The optional parameter @var{opts} is a structure that controls the behavior
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64 of @code{amd}. The fields of the structure are
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65
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66 @table @asis
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67 @item @var{opts}.dense
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68 Determines what @code{amd} considers to be a dense row or column of the
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69 input matrix. Rows or columns with more than @code{max (16, (dense *
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70 sqrt (@var{n})))} entries, where @var{n} is the order of the matrix @var{S},
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71 are ignored by @code{amd} during the calculation of the permutation.
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72 The value of dense must be a positive scalar and the default value is 10.0
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73
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74 @item @var{opts}.aggressive
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75 If this value is a nonzero scalar, then @code{amd} performs aggressive
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76 absorption. The default is not to perform aggressive absorption.
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77 @end table
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78
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79 The author of the code itself is Timothy A. Davis
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80 (see @url{http://faculty.cse.tamu.edu/davis/suitesparse.html}).
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81 @seealso{symamd, colamd}
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82 @end deftypefn */)
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83 {
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84 #if defined (HAVE_AMD)
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85
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86 int nargin = args.length ();
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87
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88 if (nargin < 1 || nargin > 2)
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89 print_usage ();
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90
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91 octave_idx_type n_row, n_col;
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92 const suitesparse_integer *ridx, *cidx;
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93 SparseMatrix sm;
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94 SparseComplexMatrix scm;
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95
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96 if (args(0).issparse ())
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97 {
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98 if (args(0).iscomplex ())
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99 {
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100 scm = args(0).sparse_complex_matrix_value ();
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101 n_row = scm.rows ();
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102 n_col = scm.cols ();
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103 ridx = to_suitesparse_intptr (scm.xridx ());
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104 cidx = to_suitesparse_intptr (scm.xcidx ());
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105 }
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106 else
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107 {
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108 sm = args(0).sparse_matrix_value ();
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109 n_row = sm.rows ();
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110 n_col = sm.cols ();
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111 ridx = to_suitesparse_intptr (sm.xridx ());
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112 cidx = to_suitesparse_intptr (sm.xcidx ());
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113 }
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114 }
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115 else
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116 {
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117 if (args(0).iscomplex ())
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118 sm = SparseMatrix (real (args(0).complex_matrix_value ()));
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119 else
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120 sm = SparseMatrix (args(0).matrix_value ());
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121
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122 n_row = sm.rows ();
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123 n_col = sm.cols ();
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124 ridx = to_suitesparse_intptr (sm.xridx ());
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125 cidx = to_suitesparse_intptr (sm.xcidx ());
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126 }
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127
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128 if (n_row != n_col)
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129 err_square_matrix_required ("amd", "S");
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130
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131 OCTAVE_LOCAL_BUFFER (double, Control, AMD_CONTROL);
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132 AMD_NAME (_defaults) (Control);
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133 if (nargin > 1)
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134 {
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135 octave_scalar_map arg1 = args(1).xscalar_map_value ("amd: OPTS argument must be a scalar structure");
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136
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137 octave_value tmp;
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138
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139 tmp = arg1.getfield ("dense");
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140 if (tmp.is_defined ())
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141 Control[AMD_DENSE] = tmp.double_value ();
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142
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143 tmp = arg1.getfield ("aggressive");
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144 if (tmp.is_defined ())
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145 Control[AMD_AGGRESSIVE] = tmp.double_value ();
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146 }
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147
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148 OCTAVE_LOCAL_BUFFER (suitesparse_integer, P, n_col);
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149 Matrix xinfo (AMD_INFO, 1);
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150 double *Info = xinfo.rwdata ();
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151
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152 // FIXME: how can we manage the memory allocation of amd
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153 // in a cleaner manner?
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154 SUITESPARSE_ASSIGN_FPTR (malloc_func, amd_malloc, malloc);
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155 SUITESPARSE_ASSIGN_FPTR (free_func, amd_free, free);
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156 SUITESPARSE_ASSIGN_FPTR (calloc_func, amd_calloc, calloc);
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157 SUITESPARSE_ASSIGN_FPTR (realloc_func, amd_realloc, realloc);
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158 SUITESPARSE_ASSIGN_FPTR (printf_func, amd_printf, printf);
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159
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160 octave_idx_type result = AMD_NAME (_order) (n_col, cidx, ridx, P, Control,
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161 Info);
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162
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163 if (result == AMD_OUT_OF_MEMORY)
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164 error ("amd: out of memory");
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165 else if (result == AMD_INVALID)
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166 error ("amd: matrix S is corrupted");
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167
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168 Matrix Pout (1, n_col);
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169 for (octave_idx_type i = 0; i < n_col; i++)
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170 Pout.xelem (i) = P[i] + 1;
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171
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172 if (nargout > 1)
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173 return ovl (Pout, xinfo);
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174 else
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175 return ovl (Pout);
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176
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177 #else
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178
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179 octave_unused_parameter (args);
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180 octave_unused_parameter (nargout);
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181
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182 err_disabled_feature ("amd", "AMD");
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183
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184 #endif
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185 }
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186
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187 /*
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188 %!shared A, A2, opts
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189 %! A = ones (20, 30);
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190 %! A2 = ones (30, 30);
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191
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192 %!testif HAVE_AMD
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193 %! assert(amd (A2), [1:30]);
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194 %! opts.dense = 25;
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195 %! assert(amd (A2, opts), [1:30]);
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196 %! opts.aggressive = 1;
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197 %! assert(amd (A2, opts), [1:30]);
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198
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199 %!testif HAVE_AMD
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200 %! assert (amd ([]), zeros (1,0))
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201
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202 %!error <S must be a square matrix|was unavailable or disabled> amd (A)
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203 %!error amd (A2, 2)
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204 */
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205
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206 OCTAVE_END_NAMESPACE(octave)