Mercurial > octave
annotate libinterp/dldfcn/fftw.cc @ 20853:1142cf6abc0d
2015 Code Sprint: remove class of function from docstring for all C++ files.
author | Rik <rik@octave.org> |
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date | Sat, 12 Dec 2015 07:40:03 -0800 |
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6228 | 1 /* |
2 | |
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3 Copyright (C) 2006-2015 David Bateman |
6228 | 4 |
5 This file is part of Octave. | |
6 | |
7 Octave is free software; you can redistribute it and/or modify it | |
8 under the terms of the GNU General Public License as published by the | |
7016 | 9 Free Software Foundation; either version 3 of the License, or (at your |
10 option) any later version. | |
6228 | 11 |
12 Octave is distributed in the hope that it will be useful, but WITHOUT | |
13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
15 for more details. | |
16 | |
17 You should have received a copy of the GNU General Public License | |
7016 | 18 along with Octave; see the file COPYING. If not, see |
19 <http://www.gnu.org/licenses/>. | |
6228 | 20 |
21 */ | |
22 | |
23 #ifdef HAVE_CONFIG_H | |
24 #include <config.h> | |
25 #endif | |
26 | |
27 #include <algorithm> | |
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28 |
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29 #include "oct-fftw.h" |
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30 |
6228 | 31 #include "defun-dld.h" |
32 #include "error.h" | |
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33 #include "ov.h" |
6228 | 34 |
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35 #include "gripes.h" |
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36 |
6228 | 37 DEFUN_DLD (fftw, args, , |
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38 "-*- texinfo -*-\n\ |
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39 @deftypefn {} {@var{method} =} fftw (\"planner\")\n\ |
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40 @deftypefnx {} {} fftw (\"planner\", @var{method})\n\ |
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41 @deftypefnx {} {@var{wisdom} =} fftw (\"dwisdom\")\n\ |
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42 @deftypefnx {} {} fftw (\"dwisdom\", @var{wisdom})\n\ |
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43 @deftypefnx {} {} fftw (\"threads\", @var{nthreads})\n\ |
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44 @deftypefnx {} {@var{nthreads} =} fftw (\"threads\")\n\ |
6228 | 45 \n\ |
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46 Manage @sc{fftw} wisdom data.\n\ |
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47 \n\ |
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48 Wisdom data can be used to significantly accelerate the calculation of the\n\ |
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49 FFTs, but implies an initial cost in its calculation. When the @sc{fftw}\n\ |
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50 libraries are initialized, they read a system wide wisdom file (typically in\n\ |
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51 @file{/etc/fftw/wisdom}), allowing wisdom to be shared between applications\n\ |
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52 other than Octave. Alternatively, the @code{fftw} function can be used to\n\ |
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53 import wisdom. For example,\n\ |
6228 | 54 \n\ |
55 @example\n\ | |
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56 @var{wisdom} = fftw (\"dwisdom\")\n\ |
6228 | 57 @end example\n\ |
58 \n\ | |
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59 @noindent\n\ |
6228 | 60 will save the existing wisdom used by Octave to the string @var{wisdom}.\n\ |
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61 This string can then be saved to a file and restored using the @code{save}\n\ |
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62 and @code{load} commands respectively. This existing wisdom can be\n\ |
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63 re-imported as follows\n\ |
6228 | 64 \n\ |
65 @example\n\ | |
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66 fftw (\"dwisdom\", @var{wisdom})\n\ |
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67 @end example\n\ |
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69 If @var{wisdom} is an empty string, then the wisdom used is cleared.\n\ |
6228 | 70 \n\ |
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71 During the calculation of Fourier transforms further wisdom is generated.\n\ |
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72 The fashion in which this wisdom is generated is also controlled by\n\ |
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73 the @code{fftw} function. There are five different manners in which the\n\ |
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74 wisdom can be treated:\n\ |
6228 | 75 \n\ |
76 @table @asis\n\ | |
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77 @item @qcode{\"estimate\"}\n\ |
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78 Specifies that no run-time measurement of the optimal means of\n\ |
6228 | 79 calculating a particular is performed, and a simple heuristic is used\n\ |
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80 to pick a (probably sub-optimal) plan. The advantage of this method is\n\ |
6228 | 81 that there is little or no overhead in the generation of the plan, which\n\ |
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82 is appropriate for a Fourier transform that will be calculated once.\n\ |
6228 | 83 \n\ |
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84 @item @qcode{\"measure\"}\n\ |
6228 | 85 In this case a range of algorithms to perform the transform is considered\n\ |
86 and the best is selected based on their execution time.\n\ | |
87 \n\ | |
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88 @item @qcode{\"patient\"}\n\ |
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89 Similar to @qcode{\"measure\"}, but a wider range of algorithms is\n\ |
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90 considered.\n\ |
6228 | 91 \n\ |
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92 @item @qcode{\"exhaustive\"}\n\ |
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93 Like @qcode{\"measure\"}, but all possible algorithms that may be used to\n\ |
6228 | 94 treat the transform are considered.\n\ |
95 \n\ | |
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96 @item @qcode{\"hybrid\"}\n\ |
6228 | 97 As run-time measurement of the algorithm can be expensive, this is a\n\ |
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98 compromise where @qcode{\"measure\"} is used for transforms up to the size\n\ |
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99 of 8192 and beyond that the @qcode{\"estimate\"} method is used.\n\ |
6228 | 100 @end table\n\ |
101 \n\ | |
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102 The default method is @qcode{\"estimate\"}. The current method can\n\ |
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103 be queried with\n\ |
6228 | 104 \n\ |
105 @example\n\ | |
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106 @var{method} = fftw (\"planner\")\n\ |
6228 | 107 @end example\n\ |
108 \n\ | |
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109 @noindent\n\ |
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110 or set by using\n\ |
6228 | 111 \n\ |
112 @example\n\ | |
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113 fftw (\"planner\", @var{method})\n\ |
6228 | 114 @end example\n\ |
115 \n\ | |
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116 Note that calculated wisdom will be lost when restarting Octave. However,\n\ |
6228 | 117 the wisdom data can be reloaded if it is saved to a file as described\n\ |
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118 above. Saved wisdom files should not be used on different platforms since\n\ |
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119 they will not be efficient and the point of calculating the wisdom is lost.\n\ |
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120 \n\ |
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121 The number of threads used for computing the plans and executing the\n\ |
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122 transforms can be set with\n\ |
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123 \n\ |
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124 @example\n\ |
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125 fftw (\"threads\", @var{NTHREADS})\n\ |
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126 @end example\n\ |
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127 \n\ |
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128 Note that octave must be compiled with multi-threaded @sc{fftw} support for\n\ |
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129 this feature. The number of processors available to the current process is\n\ |
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130 used per default.\n\ |
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131 \n\ |
6228 | 132 @seealso{fft, ifft, fft2, ifft2, fftn, ifftn}\n\ |
133 @end deftypefn") | |
134 { | |
135 octave_value retval; | |
136 | |
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137 int nargin = args.length (); |
6228 | 138 |
139 if (nargin < 1 || nargin > 2) | |
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140 print_usage (); |
6228 | 141 |
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142 #if defined (HAVE_FFTW) |
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143 std::string arg0 = args(0).xstring_value ("fftw: first argument must be a string"); |
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144 |
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145 if (arg0 == "planner") |
6228 | 146 { |
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147 if (nargin == 2) //planner setter |
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148 { |
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149 // Use STL function to convert to lower case |
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150 std::transform (arg0.begin (), arg0.end (), arg0.begin (), tolower); |
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151 |
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152 std::string arg1 = args(1).xstring_value ("fftw: METHOD must be a string"); |
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153 |
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154 std::transform (arg1.begin (), arg1.end (), arg1.begin (), tolower); |
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155 octave_fftw_planner::FftwMethod meth |
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156 = octave_fftw_planner::UNKNOWN; |
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157 octave_float_fftw_planner::FftwMethod methf |
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158 = octave_float_fftw_planner::UNKNOWN; |
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159 |
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160 if (arg1 == "estimate") |
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161 { |
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162 meth = octave_fftw_planner::ESTIMATE; |
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163 methf = octave_float_fftw_planner::ESTIMATE; |
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164 } |
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165 else if (arg1 == "measure") |
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166 { |
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167 meth = octave_fftw_planner::MEASURE; |
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168 methf = octave_float_fftw_planner::MEASURE; |
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169 } |
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170 else if (arg1 == "patient") |
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171 { |
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172 meth = octave_fftw_planner::PATIENT; |
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173 methf = octave_float_fftw_planner::PATIENT; |
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174 } |
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175 else if (arg1 == "exhaustive") |
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176 { |
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177 meth = octave_fftw_planner::EXHAUSTIVE; |
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178 methf = octave_float_fftw_planner::EXHAUSTIVE; |
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179 } |
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180 else if (arg1 == "hybrid") |
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181 { |
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182 meth = octave_fftw_planner::HYBRID; |
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183 methf = octave_float_fftw_planner::HYBRID; |
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184 } |
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185 else |
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186 error ("fftw: unrecognized planner METHOD"); |
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187 |
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188 meth = octave_fftw_planner::method (meth); |
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189 octave_float_fftw_planner::method (methf); |
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190 |
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191 if (meth == octave_fftw_planner::MEASURE) |
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192 retval = octave_value ("measure"); |
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193 else if (meth == octave_fftw_planner::PATIENT) |
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194 retval = octave_value ("patient"); |
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195 else if (meth == octave_fftw_planner::EXHAUSTIVE) |
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196 retval = octave_value ("exhaustive"); |
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197 else if (meth == octave_fftw_planner::HYBRID) |
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198 retval = octave_value ("hybrid"); |
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199 else |
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200 retval = octave_value ("estimate"); |
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201 } |
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202 else //planner getter |
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203 { |
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204 octave_fftw_planner::FftwMethod meth = |
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205 octave_fftw_planner::method (); |
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206 |
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207 if (meth == octave_fftw_planner::MEASURE) |
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208 retval = octave_value ("measure"); |
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209 else if (meth == octave_fftw_planner::PATIENT) |
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210 retval = octave_value ("patient"); |
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211 else if (meth == octave_fftw_planner::EXHAUSTIVE) |
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212 retval = octave_value ("exhaustive"); |
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213 else if (meth == octave_fftw_planner::HYBRID) |
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214 retval = octave_value ("hybrid"); |
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215 else |
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216 retval = octave_value ("estimate"); |
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217 } |
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218 } |
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219 else if (arg0 == "dwisdom") |
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220 { |
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221 if (nargin == 2) //dwisdom setter |
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222 { |
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223 // Use STL function to convert to lower case |
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224 std::transform (arg0.begin (), arg0.end (), arg0.begin (), |
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225 tolower); |
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226 |
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227 std::string arg1 = args(1).xstring_value ("fftw: WISDOM must be a string"); |
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228 |
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229 char *str = fftw_export_wisdom_to_string (); |
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230 |
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231 if (arg1.length () < 1) |
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232 fftw_forget_wisdom (); |
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233 else if (! fftw_import_wisdom_from_string (arg1.c_str ())) |
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234 error ("fftw: could not import supplied WISDOM"); |
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235 |
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236 retval = octave_value (std::string (str)); |
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237 |
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238 // FIXME: need to free string even if there is an |
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239 // exception. |
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240 free (str); |
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241 } |
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242 else //dwisdom getter |
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243 { |
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244 char *str = fftw_export_wisdom_to_string (); |
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245 retval = octave_value (std::string (str)); |
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246 |
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247 // FIXME: need to free string even if there is an |
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248 // exception. |
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249 free (str); |
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250 } |
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251 } |
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252 else if (arg0 == "swisdom") |
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253 { |
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254 //swisdom uses fftwf_ functions (float), dwisdom fftw_ (real) |
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255 if (nargin == 2) //swisdom setter |
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256 { |
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257 // Use STL function to convert to lower case |
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258 std::transform (arg0.begin (), arg0.end (), arg0.begin (), |
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259 tolower); |
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260 |
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261 std::string arg1 = args(1).xstring_value ("fftw: WISDOM must be a string"); |
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262 |
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263 char *str = fftwf_export_wisdom_to_string (); |
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264 |
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265 if (arg1.length () < 1) |
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266 fftwf_forget_wisdom (); |
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267 else if (! fftwf_import_wisdom_from_string (arg1.c_str ())) |
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268 error ("fftw: could not import supplied WISDOM"); |
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269 |
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270 retval = octave_value (std::string (str)); |
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271 |
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272 // FIXME: need to free string even if there is an |
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273 // exception. |
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274 free (str); |
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275 } |
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276 else //swisdom getter |
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277 { |
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278 char *str = fftwf_export_wisdom_to_string (); |
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279 retval = octave_value (std::string (str)); |
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280 |
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281 // FIXME: need to free string even if there is an |
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282 // exception. |
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283 free (str); |
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284 } |
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285 } |
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286 else if (arg0 == "threads") |
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287 { |
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288 if (nargin == 2) //threads setter |
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289 { |
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290 if (args(1).is_real_scalar ()) |
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291 { |
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292 int nthreads = args(1).int_value(); |
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293 if (nthreads >= 1) |
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294 { |
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295 #if defined (HAVE_FFTW3_THREADS) |
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296 octave_fftw_planner::threads (nthreads); |
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297 #else |
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298 gripe_disabled_feature ("fftw", "multithreaded FFTW"); |
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299 #endif |
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300 #if defined (HAVE_FFTW3F_THREADS) |
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301 octave_float_fftw_planner::threads (nthreads); |
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302 #else |
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303 gripe_disabled_feature ("fftw", "multithreaded FFTW"); |
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304 #endif |
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305 } |
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306 else |
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307 error ("fftw: number of threads must be >=1"); |
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308 } |
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309 else |
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310 error ("fftw: setting threads needs one integer argument"); |
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311 } |
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312 else //threads getter |
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313 #if defined (HAVE_FFTW3_THREADS) |
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314 retval = octave_value (octave_fftw_planner::threads()); |
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315 #else |
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316 retval = 1; |
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317 #endif |
6228 | 318 } |
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319 else |
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320 error ("fftw: unrecognized argument"); |
6228 | 321 #else |
322 | |
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323 gripe_disabled_feature ("fftw", "the FFTW3 planner"); |
6228 | 324 |
325 #endif | |
326 | |
327 return retval; | |
328 } | |
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329 |
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330 /* |
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331 %!testif HAVE_FFTW |
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332 %! def_method = fftw ("planner"); |
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333 %! unwind_protect |
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334 %! method = "estimate"; |
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335 %! fftw ("planner", method); |
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336 %! assert (fftw ("planner"), method); |
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337 %! method = "measure"; |
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338 %! fftw ("planner", method); |
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339 %! assert (fftw ("planner"), method); |
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340 %! method = "patient"; |
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341 %! fftw ("planner", method); |
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342 %! assert (fftw ("planner"), method); |
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343 %! method = "exhaustive"; |
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344 %! fftw ("planner", method); |
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345 %! assert (fftw ("planner"), method); |
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346 %! method = "hybrid"; |
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347 %! fftw ("planner", method); |
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348 %! assert (fftw ("planner"), method); |
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349 %! unwind_protect_cleanup |
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350 %! fftw ("planner", def_method); |
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351 %! end_unwind_protect |
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352 |
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353 %!testif HAVE_FFTW |
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354 %! def_dwisdom = fftw ("dwisdom"); |
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355 %! def_swisdom = fftw ("swisdom"); |
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356 %! unwind_protect |
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357 %! wisdom = fftw ("dwisdom"); |
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358 %! assert (ischar (wisdom)); |
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359 %! fftw ("dwisdom", wisdom); |
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360 %! assert (fftw ("dwisdom"), wisdom); |
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361 %! wisdom = fftw ("swisdom"); |
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362 %! assert (ischar (wisdom)); |
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363 %! fftw ("swisdom", wisdom); |
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364 %! assert (fftw ("swisdom"), wisdom); |
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365 %! unwind_protect_cleanup |
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366 %! fftw ("dwisdom", def_dwisdom); |
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367 %! fftw ("swisdom", def_swisdom); |
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368 %! end_unwind_protect |
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369 |
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370 %!testif HAVE_FFTW3_THREADS |
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371 %! n = fftw ("threads"); |
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372 %! unwind_protect |
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373 %! fftw ("threads", 3); |
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374 %! assert (fftw ("threads"), 3); |
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375 %! unwind_protect_cleanup |
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376 %! fftw ("threads", n); |
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377 %! end_unwind_protect |
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378 |
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379 %!error <Invalid call to fftw> fftw (); |
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380 %!error <Invalid call to fftw> fftw ("planner", "estimate", "measure"); |
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381 %!error fftw (3); |
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382 %!error fftw ("invalid"); |
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383 %!error fftw ("planner", "invalid"); |
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384 %!error fftw ("planner", 2); |
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385 %!error fftw ("dwisdom", "invalid"); |
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386 %!error fftw ("swisdom", "invalid"); |
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387 %!error fftw ("threads", "invalid"); |
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388 %!error fftw ("threads", -3); |
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389 */ |