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1 <html lang="en">
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2 <head>
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3 <title>Advanced Real-to-real Transforms - FFTW 3.3.4</title>
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4 <meta http-equiv="Content-Type" content="text/html">
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5 <meta name="description" content="FFTW 3.3.4">
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6 <meta name="generator" content="makeinfo 4.13">
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7 <link title="Top" rel="start" href="index.html#Top">
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8 <link rel="up" href="Advanced-Interface.html#Advanced-Interface" title="Advanced Interface">
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9 <link rel="prev" href="Advanced-Real_002ddata-DFTs.html#Advanced-Real_002ddata-DFTs" title="Advanced Real-data DFTs">
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10 <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
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11 <!--
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12 This manual is for FFTW
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13 (version 3.3.4, 20 September 2013).
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14
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15 Copyright (C) 2003 Matteo Frigo.
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16
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17 Copyright (C) 2003 Massachusetts Institute of Technology.
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18
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19 Permission is granted to make and distribute verbatim copies of
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20 this manual provided the copyright notice and this permission
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21 notice are preserved on all copies.
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22
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23 Permission is granted to copy and distribute modified versions of
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24 this manual under the conditions for verbatim copying, provided
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25 that the entire resulting derived work is distributed under the
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26 terms of a permission notice identical to this one.
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27
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28 Permission is granted to copy and distribute translations of this
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29 manual into another language, under the above conditions for
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30 modified versions, except that this permission notice may be
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31 stated in a translation approved by the Free Software Foundation.
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32 -->
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33 <meta http-equiv="Content-Style-Type" content="text/css">
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34 <style type="text/css"><!--
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44 --></style>
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45 </head>
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46 <body>
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47 <div class="node">
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48 <a name="Advanced-Real-to-real-Transforms"></a>
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49 <a name="Advanced-Real_002dto_002dreal-Transforms"></a>
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50 <p>
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51 Previous: <a rel="previous" accesskey="p" href="Advanced-Real_002ddata-DFTs.html#Advanced-Real_002ddata-DFTs">Advanced Real-data DFTs</a>,
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52 Up: <a rel="up" accesskey="u" href="Advanced-Interface.html#Advanced-Interface">Advanced Interface</a>
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53 <hr>
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54 </div>
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55
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56 <h4 class="subsection">4.4.3 Advanced Real-to-real Transforms</h4>
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57
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58 <pre class="example"> fftw_plan fftw_plan_many_r2r(int rank, const int *n, int howmany,
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59 double *in, const int *inembed,
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60 int istride, int idist,
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61 double *out, const int *onembed,
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62 int ostride, int odist,
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63 const fftw_r2r_kind *kind, unsigned flags);
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64 </pre>
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65 <p><a name="index-fftw_005fplan_005fmany_005fr2r-240"></a>
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66 Like <code>fftw_plan_many_dft</code>, this functions adds <code>howmany</code>,
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67 <code>nembed</code>, <code>stride</code>, and <code>dist</code> parameters to the
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68 <code>fftw_plan_r2r</code> function, but otherwise behave the same as the
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69 basic interface. The interpretation of those additional parameters are
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70 the same as for <code>fftw_plan_many_dft</code>. (Of course, the
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71 <code>stride</code> and <code>dist</code> parameters are now in units of
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72 <code>double</code>, not <code>fftw_complex</code>.)
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73
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74 <p>Arrays <code>n</code>, <code>inembed</code>, <code>onembed</code>, and <code>kind</code> are not
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75 used after this function returns. You can safely free or reuse them.
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76
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77 <!-- -->
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78 </body></html>
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79
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