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annotate src/DLD-FUNCTIONS/spparms.cc @ 10840:89f4d7e294cc

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Grammarcheck .cc files
author Rik <octave@nomad.inbox5.com>
date Sat, 31 Jul 2010 11:18:11 -0700
parents fbd7843974fa
children fd0a3ac60b0e
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) 2004, 2005, 2006, 2007, 2008, 2009 David Bateman
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4 Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004 Andy Adler
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5
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6 This file is part of Octave.
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7
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8 Octave is free software; you can redistribute it and/or modify it
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9 under the terms of the GNU General Public License as published by the
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10 Free Software Foundation; either version 3 of the License, or (at your
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11 option) any later version.
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12
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13 Octave is distributed in the hope that it will be useful, but WITHOUT
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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16 for more details.
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17
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18 You should have received a copy of the GNU General Public License
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19 along with Octave; see the file COPYING. If not, see
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20 <http://www.gnu.org/licenses/>.
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21
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22 */
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23
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24 #ifdef HAVE_CONFIG_H
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25 #include <config.h>
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26 #endif
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27
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28 #include "defun-dld.h"
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29 #include "ov.h"
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30 #include "pager.h"
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31 #include "error.h"
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32 #include "gripes.h"
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33
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34 #include "oct-spparms.h"
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35
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36 DEFUN_DLD (spparms, args, nargout,
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37 "-*- texinfo -*-\n\
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38 @deftypefn {Loadable Function} { } spparms ()\n\
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39 @deftypefnx {Loadable Function} {@var{vals} =} spparms ()\n\
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40 @deftypefnx {Loadable Function} {[@var{keys}, @var{vals}] =} spparms ()\n\
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41 @deftypefnx {Loadable Function} {@var{val} =} spparms (@var{key})\n\
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42 @deftypefnx {Loadable Function} { } spparms (@var{vals})\n\
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43 @deftypefnx {Loadable Function} { } spparms ('defaults')\n\
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44 @deftypefnx {Loadable Function} { } spparms ('tight')\n\
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45 @deftypefnx {Loadable Function} { } spparms (@var{key}, @var{val})\n\
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46 Sets or displays the parameters used by the sparse solvers and factorization\n\
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47 functions. The first four calls above get information about the current\n\
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48 settings, while the others change the current settings. The parameters are\n\
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49 stored as pairs of keys and values, where the values are all floats and the\n\
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50 keys are one of the following strings:\n\
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51 \n\
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52 @table @code\n\
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53 @item spumoni\n\
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54 Printing level of debugging information of the solvers (default 0)\n\
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55 \n\
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56 @item ths_rel\n\
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57 Included for compatibility. Not used. (default 1)\n\
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58 \n\
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59 @item ths_abs\n\
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60 Included for compatibility. Not used. (default 1)\n\
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61 \n\
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62 @item exact_d\n\
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63 Included for compatibility. Not used. (default 0)\n\
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64 \n\
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65 @item supernd\n\
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66 Included for compatibility. Not used. (default 3)\n\
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67 \n\
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68 @item rreduce\n\
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69 Included for compatibility. Not used. (default 3)\n\
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70 \n\
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71 @item wh_frac\n\
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72 Included for compatibility. Not used. (default 0.5)\n\
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73 \n\
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74 @item autommd\n\
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75 Flag whether the LU/QR and the '\\' and '/' operators will automatically\n\
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76 use the sparsity preserving mmd functions (default 1)\n\
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77 \n\
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78 @item autoamd\n\
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79 Flag whether the LU and the '\\' and '/' operators will automatically\n\
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80 use the sparsity preserving amd functions (default 1)\n\
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81 \n\
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82 @item piv_tol\n\
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83 The pivot tolerance of the @sc{umfpack} solvers (default 0.1)\n\
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84 \n\
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85 @item sym_tol\n\
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86 The pivot tolerance of the @sc{umfpack} symmetric solvers (default 0.001)\n\
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87 \n\
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88 @item bandden\n\
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89 The density of non-zero elements in a banded matrix before it is treated\n\
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90 by the @sc{lapack} banded solvers (default 0.5)\n\
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91 \n\
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92 @item umfpack\n\
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93 Flag whether the @sc{umfpack} or mmd solvers are used for the LU, '\\' and\n\
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94 '/' operations (default 1)\n\
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95 @end table\n\
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96 \n\
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97 The value of individual keys can be set with @code{spparms (@var{key},\n\
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98 @var{val})}. The default values can be restored with the special keyword\n\
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99 'defaults'. The special keyword 'tight' can be used to set the mmd solvers\n\
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100 to attempt for a sparser solution at the potential cost of longer running\n\
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101 time.\n\
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102 @end deftypefn")
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103 {
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104 octave_value_list retval;
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105 int nargin = args.length ();
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106
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107 if (nargin == 0)
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108 {
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109 if (nargout == 0)
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110 octave_sparse_params::print_info (octave_stdout, "");
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111 else if (nargout == 1)
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112 retval(0) = octave_sparse_params::get_vals ();
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113 else if (nargout == 2)
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114 {
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115 retval (0) = octave_sparse_params::get_keys ();
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116 retval (1) = octave_sparse_params::get_vals ();
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117 }
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118 else
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119 error ("spparms: too many output arguments");
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120 }
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121 else if (nargin == 1)
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122 {
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123 if (args(0).is_string ())
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124 {
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125 std::string str = args(0).string_value ();
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126 int len = str.length ();
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127 for (int i = 0; i < len; i++)
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128 str [i] = tolower (str [i]);
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129
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130 if (str == "defaults")
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131 octave_sparse_params::defaults ();
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132 else if (str == "tight")
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133 octave_sparse_params::tight ();
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134 else
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135 {
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136 double val = octave_sparse_params::get_key (str);
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137 if (xisnan (val))
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138 error ("spparams: unrecognized key");
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139 else
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140 retval (0) = val;
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141 }
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142 }
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143 else
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144 {
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145 NDArray vals = args(0).array_value ();
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146
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147 if (error_state)
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148 error ("spparms: input must be a string or a vector");
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149 else if (vals.numel () > OCTAVE_SPARSE_CONTROLS_SIZE)
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150 error ("spparams: too many elements in values vector");
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151 else
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152 octave_sparse_params::set_vals (vals);
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153 }
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154 }
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155 else if (nargin == 2)
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156 {
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157 if (args(0).is_string ())
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158 {
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159 std::string str = args(0).string_value ();
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160
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161 double val = args(1).double_value ();
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162
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163 if (error_state)
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164 error ("spparms: second argument must be a real scalar");
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165 else if (str == "umfpack")
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166 warning ("spparms: request to disable umfpack solvers ignored");
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167 else if (!octave_sparse_params::set_key (str, val))
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168 error ("spparms: key not found");
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169 }
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170 else
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171 error ("spparms: first argument must be a string");
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172 }
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173 else
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174 error ("spparms: too many input arguments");
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175
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176 return retval;
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177 }