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annotate libinterp/dldfcn/amd.cc @ 20830:b65888ec820e draft default tip gccjit

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dmalcom gcc jit import
author Stefan Mahr <dac922@gmx.de>
date Fri, 27 Feb 2015 16:59:36 +0100
parents f90c8372b7ba
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2
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3 Copyright (C) 2008-2015 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 USE_64_BIT_IDX_T
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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 Return the approximate minimum degree permutation of a matrix.\n\
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59 \n\
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60 This is a permutation such that the Cholesky@tie{}factorization of\n\
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61 @code{@var{S} (@var{p}, @var{p})} tends to be sparser than the\n\
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62 Cholesky@tie{}factorization of @var{S} itself. @code{amd} is typically\n\
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63 faster than @code{symamd} but serves a similar purpose.\n\
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64 \n\
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65 The optional parameter @var{opts} is a structure that controls the behavior\n\
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66 of @code{amd}. The fields of the structure are\n\
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67 \n\
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68 @table @asis\n\
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69 @item @var{opts}.dense\n\
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70 Determines what @code{amd} considers to be a dense row or column of the\n\
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71 input matrix. Rows or columns with more than @code{max (16, (dense *\n\
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72 sqrt (@var{n})))} entries, where @var{n} is the order of the matrix @var{S},\n\
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73 are ignored by @code{amd} during the calculation of the permutation.\n\
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74 The value of dense must be a positive scalar and the default value is 10.0\n\
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75 \n\
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76 @item @var{opts}.aggressive\n\
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77 If this value is a nonzero scalar, then @code{amd} performs aggressive\n\
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78 absorption. The default is not to perform aggressive absorption.\n\
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79 @end table\n\
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80 \n\
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81 The author of the code itself is Timothy A. Davis\n\
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82 @email{davis@@cise.ufl.edu}, University of Florida\n\
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83 (see @url{http://www.cise.ufl.edu/research/sparse/amd}).\n\
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84 @seealso{symamd, colamd}\n\
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85 @end deftypefn")
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86 {
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87 octave_value_list retval;
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88
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89 #ifdef HAVE_AMD
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90 int nargin = args.length ();
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91
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92 if (nargin < 1 || nargin > 2)
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93 print_usage ();
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94 else
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95 {
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96 octave_idx_type n_row, n_col;
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97 const octave_idx_type *ridx, *cidx;
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98 SparseMatrix sm;
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99 SparseComplexMatrix scm;
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100
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101 if (args(0).is_sparse_type ())
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102 {
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103 if (args(0).is_complex_type ())
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104 {
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105 scm = args(0).sparse_complex_matrix_value ();
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106 n_row = scm.rows ();
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107 n_col = scm.cols ();
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108 ridx = scm.xridx ();
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109 cidx = scm.xcidx ();
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110 }
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111 else
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112 {
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113 sm = args(0).sparse_matrix_value ();
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114 n_row = sm.rows ();
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115 n_col = sm.cols ();
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116 ridx = sm.xridx ();
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117 cidx = sm.xcidx ();
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118 }
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119 }
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120 else
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121 {
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122 if (args(0).is_complex_type ())
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123 sm = SparseMatrix (real (args(0).complex_matrix_value ()));
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124 else
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125 sm = SparseMatrix (args(0).matrix_value ());
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126
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127 n_row = sm.rows ();
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128 n_col = sm.cols ();
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129 ridx = sm.xridx ();
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130 cidx = sm.xcidx ();
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131 }
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132
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133 if (!error_state && n_row != n_col)
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134 error ("amd: matrix S must be square");
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135
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136 OCTAVE_LOCAL_BUFFER (double, Control, AMD_CONTROL);
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137 AMD_NAME (_defaults) (Control) ;
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138 if (nargin > 1)
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139 {
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140 octave_scalar_map arg1 = args(1).scalar_map_value ();
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141
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142 if (!error_state)
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143 {
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144 octave_value tmp;
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145
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146 tmp = arg1.getfield ("dense");
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147 if (tmp.is_defined ())
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148 Control[AMD_DENSE] = tmp.double_value ();
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149
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150 tmp = arg1.getfield ("aggressive");
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151 if (tmp.is_defined ())
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152 Control[AMD_AGGRESSIVE] = tmp.double_value ();
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153 }
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154 else
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155 error ("amd: OPTS argument must be a scalar structure");
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156 }
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157
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158 if (!error_state)
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159 {
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160 OCTAVE_LOCAL_BUFFER (octave_idx_type, P, n_col);
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161 Matrix xinfo (AMD_INFO, 1);
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162 double *Info = xinfo.fortran_vec ();
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163
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164 // FIXME: how can we manage the memory allocation of amd
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165 // in a cleaner manner?
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166 SUITESPARSE_ASSIGN_FPTR (malloc_func, amd_malloc, malloc);
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167 SUITESPARSE_ASSIGN_FPTR (free_func, amd_free, free);
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168 SUITESPARSE_ASSIGN_FPTR (calloc_func, amd_calloc, calloc);
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169 SUITESPARSE_ASSIGN_FPTR (realloc_func, amd_realloc, realloc);
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170 SUITESPARSE_ASSIGN_FPTR (printf_func, amd_printf, printf);
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171
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172 octave_idx_type result = AMD_NAME (_order) (n_col, cidx, ridx, P,
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173 Control, Info);
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174
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175 switch (result)
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176 {
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177 case AMD_OUT_OF_MEMORY:
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178 error ("amd: out of memory");
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179 break;
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180
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181 case AMD_INVALID:
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182 error ("amd: matrix S is corrupted");
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183 break;
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184
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185 default:
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186 {
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187 if (nargout > 1)
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188 retval(1) = xinfo;
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189
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190 Matrix Pout (1, n_col);
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191 for (octave_idx_type i = 0; i < n_col; i++)
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192 Pout.xelem (i) = P[i] + 1;
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193
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194 retval(0) = Pout;
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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 }
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207 /*
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208 %!shared A, A2, opts
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209 %! A = ones (20, 30);
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210 %! A2 = ones (30, 30);
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211 %!
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212 %!testif HAVE_AMD
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213 %! assert(amd (A2), [1:30])
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214 %! opts.dense = 25;
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215 %! assert(amd (A2, opts), [1:30])
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216 %! opts.aggressive = 1;
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217 %! assert(amd (A2, opts), [1:30])
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218
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219 %!error <matrix S must be square|not available in this version> amd (A)
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220 %!error amd (A2, 2)
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221 %!error <matrix S is corrupted|not available in this version> amd ([])
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222 */