Mercurial > octave
annotate libinterp/dldfcn/fftw.cc @ 27923:bd51beb6205e
update formatting of copyright notices
* Use <https://octave.org/copyright/> instead of
<https://octave.org/COPYRIGHT.html/>.
* For consistency with other comments in the Octave sources, use
C++-style comments for copyright blocks in C and C++ files.
* Use delimiters above and below copyright blocks that are appropriate
for the language used in the file.
* Eliminate extra spacing inside copyright blocks.
* lex.ll (looks_like_copyright): Also allow newlines and carriage
returns before the word "Copyright".
* scripts/mk-doc.pl (gethelp): Also skip empty comment lines.
* bp-table.cc, type.m: Adjust tests.
author | John W. Eaton <jwe@octave.org> |
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date | Wed, 08 Jan 2020 11:59:41 -0500 |
parents | 1891570abac8 |
children | 0a5b15007766 |
rev | line source |
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1 //////////////////////////////////////////////////////////////////////// |
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2 // |
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3 // Copyright (C) 2006-2020 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 //////////////////////////////////////////////////////////////////////// |
6228 | 25 |
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26 #if defined (HAVE_CONFIG_H) |
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27 # include "config.h" |
6228 | 28 #endif |
29 | |
30 #include <algorithm> | |
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31 #include <string> |
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32 |
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33 #if defined (HAVE_FFTW3_H) |
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34 # include <fftw3.h> |
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35 #endif |
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36 |
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37 #include "oct-fftw.h" |
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38 |
6228 | 39 #include "defun-dld.h" |
40 #include "error.h" | |
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41 #include "errwarn.h" |
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42 #include "ov.h" |
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44 DEFUN_DLD (fftw, args, , | |
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45 doc: /* -*- texinfo -*- |
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46 @deftypefn {} {@var{method} =} fftw ("planner") |
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47 @deftypefnx {} {} fftw ("planner", @var{method}) |
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48 @deftypefnx {} {@var{wisdom} =} fftw ("dwisdom") |
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49 @deftypefnx {} {} fftw ("dwisdom", @var{wisdom}) |
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50 @deftypefnx {} {} fftw ("threads", @var{nthreads}) |
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51 @deftypefnx {} {@var{nthreads} =} fftw ("threads") |
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52 |
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53 Manage @sc{fftw} wisdom data. |
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54 |
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55 Wisdom data can be used to significantly accelerate the calculation of the |
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56 FFTs, but implies an initial cost in its calculation. When the @sc{fftw} |
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57 libraries are initialized, they read a system wide wisdom file (typically in |
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58 @file{/etc/fftw/wisdom}), allowing wisdom to be shared between applications |
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59 other than Octave. Alternatively, the @code{fftw} function can be used to |
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60 import wisdom. For example, |
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61 |
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62 @example |
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63 @var{wisdom} = fftw ("dwisdom") |
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64 @end example |
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65 |
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66 @noindent |
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67 will save the existing wisdom used by Octave to the string @var{wisdom}. |
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68 This string can then be saved to a file and restored using the @code{save} |
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69 and @code{load} commands respectively. This existing wisdom can be |
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70 re-imported as follows |
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71 |
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72 @example |
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73 fftw ("dwisdom", @var{wisdom}) |
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74 @end example |
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75 |
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76 If @var{wisdom} is an empty string, then the wisdom used is cleared. |
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77 |
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78 During the calculation of Fourier transforms further wisdom is generated. |
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79 The fashion in which this wisdom is generated is also controlled by |
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80 the @code{fftw} function. There are five different manners in which the |
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81 wisdom can be treated: |
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82 |
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83 @table @asis |
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84 @item @qcode{"estimate"} |
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85 Specifies that no run-time measurement of the optimal means of |
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86 calculating a particular is performed, and a simple heuristic is used |
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87 to pick a (probably sub-optimal) plan. The advantage of this method is |
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88 that there is little or no overhead in the generation of the plan, which |
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89 is appropriate for a Fourier transform that will be calculated once. |
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90 |
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91 @item @qcode{"measure"} |
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92 In this case a range of algorithms to perform the transform is considered |
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93 and the best is selected based on their execution time. |
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94 |
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95 @item @qcode{"patient"} |
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96 Similar to @qcode{"measure"}, but a wider range of algorithms is |
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97 considered. |
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98 |
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99 @item @qcode{"exhaustive"} |
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100 Like @qcode{"measure"}, but all possible algorithms that may be used to |
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101 treat the transform are considered. |
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102 |
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103 @item @qcode{"hybrid"} |
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104 As run-time measurement of the algorithm can be expensive, this is a |
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105 compromise where @qcode{"measure"} is used for transforms up to the size |
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106 of 8192 and beyond that the @qcode{"estimate"} method is used. |
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107 @end table |
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108 |
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109 The default method is @qcode{"estimate"}. The current method can |
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110 be queried with |
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111 |
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112 @example |
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113 @var{method} = fftw ("planner") |
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114 @end example |
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115 |
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116 @noindent |
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117 or set by using |
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118 |
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119 @example |
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120 fftw ("planner", @var{method}) |
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121 @end example |
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122 |
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123 Note that calculated wisdom will be lost when restarting Octave. However, |
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124 the wisdom data can be reloaded if it is saved to a file as described |
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125 above. Saved wisdom files should not be used on different platforms since |
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126 they will not be efficient and the point of calculating the wisdom is lost. |
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127 |
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128 The number of threads used for computing the plans and executing the |
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129 transforms can be set with |
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130 |
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131 @example |
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132 fftw ("threads", @var{NTHREADS}) |
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133 @end example |
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134 |
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135 Note that octave must be compiled with multi-threaded @sc{fftw} support for |
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136 this feature. The number of processors available to the current process is |
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137 used per default. |
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138 |
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139 @seealso{fft, ifft, fft2, ifft2, fftn, ifftn} |
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140 @end deftypefn */) |
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142 #if defined (HAVE_FFTW) |
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144 int nargin = args.length (); |
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146 if (nargin < 1 || nargin > 2) | |
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147 print_usage (); |
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149 octave_value retval; |
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150 |
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151 std::string arg0 = args(0).xstring_value ("fftw: first argument must be a string"); |
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152 |
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153 if (arg0 == "planner") |
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155 if (nargin == 2) // planner setter |
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156 { |
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157 // Use STL function to convert to lower case |
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158 std::transform (arg0.begin (), arg0.end (), arg0.begin (), tolower); |
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159 |
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160 std::string arg1 = args(1).xstring_value ("fftw: METHOD must be a string"); |
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161 |
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162 std::transform (arg1.begin (), arg1.end (), arg1.begin (), tolower); |
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163 octave::fftw_planner::FftwMethod meth |
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164 = octave::fftw_planner::UNKNOWN; |
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165 octave::float_fftw_planner::FftwMethod methf |
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166 = octave::float_fftw_planner::UNKNOWN; |
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167 |
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168 if (arg1 == "estimate") |
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169 { |
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170 meth = octave::fftw_planner::ESTIMATE; |
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171 methf = octave::float_fftw_planner::ESTIMATE; |
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172 } |
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173 else if (arg1 == "measure") |
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174 { |
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175 meth = octave::fftw_planner::MEASURE; |
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176 methf = octave::float_fftw_planner::MEASURE; |
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177 } |
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178 else if (arg1 == "patient") |
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179 { |
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180 meth = octave::fftw_planner::PATIENT; |
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181 methf = octave::float_fftw_planner::PATIENT; |
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182 } |
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183 else if (arg1 == "exhaustive") |
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184 { |
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185 meth = octave::fftw_planner::EXHAUSTIVE; |
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186 methf = octave::float_fftw_planner::EXHAUSTIVE; |
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187 } |
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188 else if (arg1 == "hybrid") |
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189 { |
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190 meth = octave::fftw_planner::HYBRID; |
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191 methf = octave::float_fftw_planner::HYBRID; |
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192 } |
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193 else |
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194 error ("fftw: unrecognized planner METHOD"); |
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195 |
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196 meth = octave::fftw_planner::method (meth); |
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197 octave::float_fftw_planner::method (methf); |
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198 |
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199 if (meth == octave::fftw_planner::MEASURE) |
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200 retval = octave_value ("measure"); |
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201 else if (meth == octave::fftw_planner::PATIENT) |
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202 retval = octave_value ("patient"); |
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203 else if (meth == octave::fftw_planner::EXHAUSTIVE) |
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204 retval = octave_value ("exhaustive"); |
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205 else if (meth == octave::fftw_planner::HYBRID) |
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206 retval = octave_value ("hybrid"); |
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207 else |
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208 retval = octave_value ("estimate"); |
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209 } |
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210 else //planner getter |
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211 { |
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212 octave::fftw_planner::FftwMethod meth |
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213 = octave::fftw_planner::method (); |
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214 |
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215 if (meth == octave::fftw_planner::MEASURE) |
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216 retval = octave_value ("measure"); |
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217 else if (meth == octave::fftw_planner::PATIENT) |
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218 retval = octave_value ("patient"); |
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219 else if (meth == octave::fftw_planner::EXHAUSTIVE) |
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220 retval = octave_value ("exhaustive"); |
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221 else if (meth == octave::fftw_planner::HYBRID) |
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222 retval = octave_value ("hybrid"); |
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223 else |
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224 retval = octave_value ("estimate"); |
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225 } |
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226 } |
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227 else if (arg0 == "dwisdom") |
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228 { |
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229 if (nargin == 2) //dwisdom setter |
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230 { |
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231 // Use STL function to convert to lower case |
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232 std::transform (arg0.begin (), arg0.end (), arg0.begin (), |
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233 tolower); |
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234 |
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235 std::string arg1 = args(1).xstring_value ("fftw: WISDOM must be a string"); |
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236 |
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237 char *str = fftw_export_wisdom_to_string (); |
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238 if (! str) |
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239 error ("fftw: could not get current FFTW wisdom"); |
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240 |
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241 std::string wisdom_str (str); |
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242 free (str); |
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243 |
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244 if (arg1.length () < 1) |
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245 fftw_forget_wisdom (); |
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246 else if (! fftw_import_wisdom_from_string (arg1.c_str ())) |
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247 error ("fftw: could not import supplied WISDOM"); |
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248 |
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249 retval = octave_value (wisdom_str); |
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250 } |
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251 else //dwisdom getter |
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252 { |
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253 char *str = fftw_export_wisdom_to_string (); |
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254 if (! str) |
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255 error ("fftw: could not get current FFTW wisdom"); |
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256 |
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257 std::string wisdom_str (str); |
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258 free (str); |
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259 retval = octave_value (wisdom_str); |
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260 } |
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261 } |
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262 else if (arg0 == "swisdom") |
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263 { |
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264 //swisdom uses fftwf_ functions (float), dwisdom fftw_ (real) |
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265 if (nargin == 2) //swisdom setter |
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266 { |
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267 // Use STL function to convert to lower case |
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268 std::transform (arg0.begin (), arg0.end (), arg0.begin (), |
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269 tolower); |
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270 |
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271 std::string arg1 = args(1).xstring_value ("fftw: WISDOM must be a string"); |
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272 |
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273 char *str = fftwf_export_wisdom_to_string (); |
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274 if (! str) |
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275 error ("fftw: could not get current FFTW wisdom"); |
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276 |
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277 std::string wisdom_str (str); |
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278 free (str); |
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279 |
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280 if (arg1.length () < 1) |
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281 fftwf_forget_wisdom (); |
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282 else if (! fftwf_import_wisdom_from_string (arg1.c_str ())) |
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283 error ("fftw: could not import supplied WISDOM"); |
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284 |
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285 retval = octave_value (wisdom_str); |
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286 } |
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287 else //swisdom getter |
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288 { |
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289 char *str = fftwf_export_wisdom_to_string (); |
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290 if (! str) |
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291 error ("fftw: could not get current FFTW wisdom"); |
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292 |
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293 std::string wisdom_str (str); |
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294 free (str); |
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295 retval = octave_value (wisdom_str); |
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296 } |
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297 } |
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298 else if (arg0 == "threads") |
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299 { |
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300 if (nargin == 2) //threads setter |
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301 { |
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302 if (! args(1).is_real_scalar ()) |
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303 error ("fftw: setting threads needs one integer argument"); |
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304 |
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305 int nthreads = args(1).int_value(); |
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306 if (nthreads < 1) |
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307 error ("fftw: number of threads must be >=1"); |
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308 |
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309 #if defined (HAVE_FFTW3_THREADS) |
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310 octave::fftw_planner::threads (nthreads); |
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311 #else |
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312 err_disabled_feature ("fftw", "multithreaded FFTW"); |
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313 #endif |
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314 #if defined (HAVE_FFTW3F_THREADS) |
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315 octave::float_fftw_planner::threads (nthreads); |
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316 #else |
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317 err_disabled_feature ("fftw", "multithreaded FFTW"); |
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318 #endif |
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319 } |
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320 else //threads getter |
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321 #if defined (HAVE_FFTW3_THREADS) |
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322 retval = octave_value (octave::fftw_planner::threads()); |
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323 #else |
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324 retval = 1; |
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325 #endif |
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327 else |
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328 error ("fftw: unrecognized argument"); |
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329 |
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330 return retval; |
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331 |
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333 |
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334 octave_unused_parameter (args); |
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335 |
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336 err_disabled_feature ("fftw", "the FFTW3 planner"); |
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337 |
6228 | 338 #endif |
339 } | |
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340 |
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341 /* |
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342 %!testif HAVE_FFTW |
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343 %! def_method = fftw ("planner"); |
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344 %! unwind_protect |
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345 %! method = "estimate"; |
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346 %! fftw ("planner", method); |
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347 %! assert (fftw ("planner"), method); |
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348 %! method = "measure"; |
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349 %! fftw ("planner", method); |
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350 %! assert (fftw ("planner"), method); |
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351 %! method = "patient"; |
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352 %! fftw ("planner", method); |
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353 %! assert (fftw ("planner"), method); |
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354 %! method = "exhaustive"; |
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355 %! fftw ("planner", method); |
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356 %! assert (fftw ("planner"), method); |
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357 %! method = "hybrid"; |
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358 %! fftw ("planner", method); |
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359 %! assert (fftw ("planner"), method); |
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360 %! unwind_protect_cleanup |
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361 %! fftw ("planner", def_method); |
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362 %! end_unwind_protect |
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363 |
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364 %!testif HAVE_FFTW |
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365 %! def_dwisdom = fftw ("dwisdom"); |
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366 %! def_swisdom = fftw ("swisdom"); |
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367 %! unwind_protect |
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368 %! wisdom = fftw ("dwisdom"); |
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369 %! assert (ischar (wisdom)); |
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370 %! fftw ("dwisdom", wisdom); |
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371 %! assert (fftw ("dwisdom"), wisdom); |
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372 %! wisdom = fftw ("swisdom"); |
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373 %! assert (ischar (wisdom)); |
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374 %! fftw ("swisdom", wisdom); |
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375 %! assert (fftw ("swisdom"), wisdom); |
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376 %! unwind_protect_cleanup |
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377 %! fftw ("dwisdom", def_dwisdom); |
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378 %! fftw ("swisdom", def_swisdom); |
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379 %! end_unwind_protect |
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380 |
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381 %!testif HAVE_FFTW3_THREADS |
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382 %! n = fftw ("threads"); |
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383 %! unwind_protect |
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384 %! fftw ("threads", 3); |
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385 %! assert (fftw ("threads"), 3); |
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386 %! unwind_protect_cleanup |
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387 %! fftw ("threads", n); |
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388 %! end_unwind_protect |
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389 |
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390 %!error <Invalid call to fftw|was unavailable or disabled> fftw () |
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391 %!error <Invalid call to fftw|was unavailable or disabled> fftw ("planner", "estimate", "measure") |
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392 %!error fftw (3) |
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393 %!error fftw ("invalid") |
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394 %!error fftw ("planner", "invalid") |
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395 %!error fftw ("planner", 2) |
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396 %!error fftw ("dwisdom", "invalid") |
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397 %!error fftw ("swisdom", "invalid") |
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398 %!error fftw ("threads", "invalid") |
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399 %!error fftw ("threads", -3) |
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400 */ |