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>
date Wed, 08 Jan 2020 11:59:41 -0500
parents 1891570abac8
children 0a5b15007766
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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 ////////////////////////////////////////////////////////////////////////
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25
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26 #if defined (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 <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
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39 #include "defun-dld.h"
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40 #include "error.h"
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41 #include "errwarn.h"
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42 #include "ov.h"
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43
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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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141 {
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142 #if defined (HAVE_FFTW)
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143
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144 int nargin = args.length ();
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145
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146 if (nargin < 1 || nargin > 2)
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147 print_usage ();
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148
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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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154 {
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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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40dfc0c99116 DLD-FUNCTIONS/*.cc: untabify
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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 {
27277
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diff changeset
212 octave::fftw_planner::FftwMethod meth
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213 = octave::fftw_planner::method ();
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diff changeset
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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diff changeset
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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diff changeset
228 {
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229 if (nargin == 2) //dwisdom setter
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diff changeset
230 {
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diff changeset
231 // Use STL function to convert to lower case
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diff changeset
232 std::transform (arg0.begin (), arg0.end (), arg0.begin (),
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diff changeset
233 tolower);
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diff changeset
234
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68e3a747ca02 rename octave_value value extractors that accept error message args
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diff changeset
235 std::string arg1 = args(1).xstring_value ("fftw: WISDOM must be a string");
20579
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diff changeset
236
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diff changeset
237 char *str = fftw_export_wisdom_to_string ();
24661
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diff changeset
238 if (! str)
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diff changeset
239 error ("fftw: could not get current FFTW wisdom");
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240
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diff changeset
241 std::string wisdom_str (str);
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diff changeset
242 free (str);
20579
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diff changeset
243
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diff changeset
244 if (arg1.length () < 1)
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diff changeset
245 fftw_forget_wisdom ();
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diff changeset
246 else if (! fftw_import_wisdom_from_string (arg1.c_str ()))
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diff changeset
247 error ("fftw: could not import supplied WISDOM");
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diff changeset
248
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diff changeset
249 retval = octave_value (wisdom_str);
20579
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diff changeset
250 }
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diff changeset
251 else //dwisdom getter
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diff changeset
252 {
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diff changeset
253 char *str = fftw_export_wisdom_to_string ();
24661
02989d7d68dc fftw: report error if FFTW library fails to return wisdom (bug #52244)
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diff changeset
254 if (! str)
02989d7d68dc fftw: report error if FFTW library fails to return wisdom (bug #52244)
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parents: 24534
diff changeset
255 error ("fftw: could not get current FFTW wisdom");
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parents: 24534
diff changeset
256
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diff changeset
257 std::string wisdom_str (str);
20579
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diff changeset
258 free (str);
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diff changeset
259 retval = octave_value (wisdom_str);
20579
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diff changeset
260 }
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diff changeset
261 }
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diff changeset
262 else if (arg0 == "swisdom")
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diff changeset
263 {
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diff changeset
264 //swisdom uses fftwf_ functions (float), dwisdom fftw_ (real)
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diff changeset
265 if (nargin == 2) //swisdom setter
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diff changeset
266 {
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diff changeset
267 // Use STL function to convert to lower case
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diff changeset
268 std::transform (arg0.begin (), arg0.end (), arg0.begin (),
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diff changeset
269 tolower);
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diff changeset
270
20700
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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
22407
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324 retval = 1;
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325 #endif
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dbateman
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326 }
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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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diff changeset
332 #else
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333
263d18409fdf Eliminate unused variable warnings for conditionally compiled code.
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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
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338 #endif
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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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diff changeset
361 %! fftw ("planner", def_method);
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362 %! end_unwind_protect
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diff changeset
363
19130
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364 %!testif HAVE_FFTW
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365 %! def_dwisdom = fftw ("dwisdom");
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diff changeset
366 %! def_swisdom = fftw ("swisdom");
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diff changeset
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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diff changeset
372 %! wisdom = fftw ("swisdom");
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diff changeset
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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diff changeset
376 %! unwind_protect_cleanup
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diff changeset
377 %! fftw ("dwisdom", def_dwisdom);
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diff changeset
378 %! fftw ("swisdom", def_swisdom);
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diff changeset
379 %! end_unwind_protect
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diff changeset
380
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381 %!testif HAVE_FFTW3_THREADS
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diff changeset
382 %! n = fftw ("threads");
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diff changeset
383 %! unwind_protect
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diff changeset
384 %! fftw ("threads", 3);
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diff changeset
385 %! assert (fftw ("threads"), 3);
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diff changeset
386 %! unwind_protect_cleanup
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diff changeset
387 %! fftw ("threads", n);
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diff changeset
388 %! end_unwind_protect
19130
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diff changeset
389
22271
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diff changeset
390 %!error <Invalid call to fftw|was unavailable or disabled> fftw ()
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diff changeset
391 %!error <Invalid call to fftw|was unavailable or disabled> fftw ("planner", "estimate", "measure")
21581
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diff changeset
392 %!error fftw (3)
6fab85c1538f maint: Follow Octave conventions for use of semicolon in BIST tests.
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diff changeset
393 %!error fftw ("invalid")
6fab85c1538f maint: Follow Octave conventions for use of semicolon in BIST tests.
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diff changeset
394 %!error fftw ("planner", "invalid")
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diff changeset
395 %!error fftw ("planner", 2)
6fab85c1538f maint: Follow Octave conventions for use of semicolon in BIST tests.
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diff changeset
396 %!error fftw ("dwisdom", "invalid")
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diff changeset
397 %!error fftw ("swisdom", "invalid")
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diff changeset
398 %!error fftw ("threads", "invalid")
6fab85c1538f maint: Follow Octave conventions for use of semicolon in BIST tests.
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diff changeset
399 %!error fftw ("threads", -3)
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diff changeset
400 */