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annotate src/DLD-FUNCTIONS/amd.cc @ 11053:c33b7054f1f9

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in recent Octave_map -> octave_scalar_map changes, use GETFIELD to access map elements, not CONTENTS
author John W. Eaton <jwe@octave.org>
date Wed, 29 Sep 2010 12:57:43 -0400
parents 14993c9e857e
children fd0a3ac60b0e
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1 /*
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2
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3 Copyright (C) 2008, 2009 David Bateman
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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 // This is the octave interface to amd, which bore the copyright given
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24 // in the help of the functions.
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25
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26 #ifdef HAVE_CONFIG_H
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27 #include <config.h>
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28 #endif
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29
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30 #include <cstdlib>
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31
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32 #include <string>
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33 #include <vector>
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34
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35 #include "ov.h"
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36 #include "defun-dld.h"
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37 #include "pager.h"
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38 #include "ov-re-mat.h"
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39
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40 #include "ov-re-sparse.h"
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41 #include "ov-cx-sparse.h"
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42 #include "oct-map.h"
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43
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44 #include "oct-sparse.h"
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45 #include "oct-locbuf.h"
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46
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47 #ifdef IDX_TYPE_LONG
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48 #define AMD_NAME(name) amd_l ## name
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49 #else
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50 #define AMD_NAME(name) amd ## name
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51 #endif
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52
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53 DEFUN_DLD (amd, args, nargout,
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54 "-*- texinfo -*-\n\
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55 @deftypefn {Loadable Function} {@var{p} =} amd (@var{s})\n\
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56 @deftypefnx {Loadable Function} {@var{p} =} amd (@var{s}, @var{opts})\n\
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57 \n\
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58 Returns the approximate minimum degree permutation of a matrix. This\n\
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59 permutation such that the Cholesky factorization of @code{@var{s} (@var{p},\n\
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60 @var{p})} tends to be sparser than the Cholesky factorization of @var{s}\n\
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61 itself. @code{amd} is typically faster than @code{symamd} but serves a\n\
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62 similar purpose.\n\
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63 \n\
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64 The optional parameter @var{opts} is a structure that controls the\n\
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65 behavior of @code{amd}. The fields of these structure are\n\
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66 \n\
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67 @table @asis\n\
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68 @item opts.dense\n\
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69 Determines what @code{amd} considers to be a dense row or column of the\n\
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70 input matrix. Rows or columns with more than @code{max(16, (dense *\n\
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71 sqrt (@var{n})} entries, where @var{n} is the order of the matrix @var{s},\n\
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72 are ignored by @code{amd} during the calculation of the permutation\n\
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73 The value of dense must be a positive scalar and its default value is 10.0\n\
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74 \n\
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75 @item opts.aggressive\n\
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76 If this value is a non zero scalar, then @code{amd} performs aggressive\n\
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77 absorption. The default is not to perform aggressive absorption.\n\
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78 @end table\n\
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79 \n\
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80 The author of the code itself is Timothy A. Davis\n\
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81 @email{davis@@cise.ufl.edu}, University of Florida (see\n\
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82 @url{http://www.cise.ufl.edu/research/sparse/amd}).\n\
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83 @seealso{symamd, colamd}\n\
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84 @end deftypefn")
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85 {
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86 octave_value_list retval;
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87
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88 #ifdef HAVE_AMD
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89 int nargin = args.length ();
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90
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91 if (nargin < 1 || nargin > 2)
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92 print_usage ();
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93 else
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94 {
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95 octave_idx_type n_row, n_col;
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96 const octave_idx_type *ridx, *cidx;
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97 SparseMatrix sm;
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98 SparseComplexMatrix scm;
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99
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100 if (args(0).is_sparse_type ())
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101 {
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102 if (args(0).is_complex_type ())
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103 {
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104 scm = args(0).sparse_complex_matrix_value ();
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105 n_row = scm.rows ();
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106 n_col = scm.cols ();
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107 ridx = scm.xridx ();
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108 cidx = scm.xcidx ();
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109 }
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110 else
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111 {
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112 sm = args(0).sparse_matrix_value ();
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113 n_row = sm.rows ();
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114 n_col = sm.cols ();
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115 ridx = sm.xridx ();
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116 cidx = sm.xcidx ();
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117 }
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118 }
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119 else
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120 {
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121 if (args(0).is_complex_type ())
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122 sm = SparseMatrix (real (args(0).complex_matrix_value ()));
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123 else
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124 sm = SparseMatrix (args(0).matrix_value ());
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125
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126 n_row = sm.rows ();
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127 n_col = sm.cols ();
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128 ridx = sm.xridx ();
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129 cidx = sm.xcidx ();
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130 }
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131
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132 if (!error_state && n_row != n_col)
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133 error ("amd: input matrix must be square");
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134
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135 if (!error_state)
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136 {
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137 OCTAVE_LOCAL_BUFFER (double, Control, AMD_CONTROL);
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138 AMD_NAME (_defaults) (Control) ;
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139 if (nargin > 1)
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140 {
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141 octave_scalar_map arg1 = args(1).scalar_map_value ();
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142
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143 if (!error_state)
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144 {
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145 octave_value tmp;
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146
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147 tmp = arg1.getfield ("dense");
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148 if (tmp.is_defined ())
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149 Control[AMD_DENSE] = tmp.double_value ();
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150
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151 tmp = arg1.getfield ("aggressive");
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152 if (tmp.is_defined ())
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153 Control[AMD_AGGRESSIVE] = tmp.double_value ();
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154 }
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155 else
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156 error ("amd: options argument must be a scalar structure");
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157 }
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158
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159 if (!error_state)
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160 {
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161 OCTAVE_LOCAL_BUFFER (octave_idx_type, P, n_col);
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162 Matrix xinfo (AMD_INFO, 1);
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163 double *Info = xinfo.fortran_vec ();
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164
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165 // FIXME -- how can we manage the memory allocation of
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166 // amd in a cleaner manner?
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167 amd_malloc = malloc;
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168 amd_free = free;
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169 amd_calloc = calloc;
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170 amd_realloc = realloc;
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171 amd_printf = printf;
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172
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173 octave_idx_type result = AMD_NAME (_order) (n_col, cidx, ridx, P,
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174 Control, Info);
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175
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176 switch (result)
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177 {
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178 case AMD_OUT_OF_MEMORY:
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179 error ("amd: out of memory");
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180 break;
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181 case AMD_INVALID:
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182 error ("amd: input matrix is corrupted");
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183 break;
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184 default:
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185 {
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186 if (nargout > 1)
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187 retval(1) = xinfo;
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188
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189 Matrix Pout (1, n_col);
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190 for (octave_idx_type i = 0; i < n_col; i++)
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191 Pout.xelem (i) = P[i] + 1;
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192
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193 retval (0) = Pout;
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194 }
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195 }
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196 }
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197 }
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198 }
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199 #else
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200
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201 error ("amd: not available in this version of Octave");
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202
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203 #endif
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204
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205 return retval;
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206 }