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1 <html lang="en">
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2 <head>
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3 <title>Guru Real-to-real Transforms - FFTW 3.3.3</title>
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4 <meta http-equiv="Content-Type" content="text/html">
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5 <meta name="description" content="FFTW 3.3.3">
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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="Guru-Interface.html#Guru-Interface" title="Guru Interface">
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9 <link rel="prev" href="Guru-Real_002ddata-DFTs.html#Guru-Real_002ddata-DFTs" title="Guru Real-data DFTs">
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10 <link rel="next" href="64_002dbit-Guru-Interface.html#g_t64_002dbit-Guru-Interface" title="64-bit Guru Interface">
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11 <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
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12 <!--
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13 This manual is for FFTW
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14 (version 3.3.3, 25 November 2012).
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15
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16 Copyright (C) 2003 Matteo Frigo.
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17
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18 Copyright (C) 2003 Massachusetts Institute of Technology.
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19
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20 Permission is granted to make and distribute verbatim copies of
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21 this manual provided the copyright notice and this permission
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22 notice are preserved on all copies.
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23
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24 Permission is granted to copy and distribute modified versions of
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25 this manual under the conditions for verbatim copying, provided
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26 that the entire resulting derived work is distributed under the
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27 terms of a permission notice identical to this one.
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28
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29 Permission is granted to copy and distribute translations of this
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30 manual into another language, under the above conditions for
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31 modified versions, except that this permission notice may be
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32 stated in a translation approved by the Free Software Foundation.
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33 -->
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34 <meta http-equiv="Content-Style-Type" content="text/css">
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35 <style type="text/css"><!--
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45 --></style>
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46 </head>
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47 <body>
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48 <div class="node">
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49 <a name="Guru-Real-to-real-Transforms"></a>
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50 <a name="Guru-Real_002dto_002dreal-Transforms"></a>
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51 <p>
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52 Next: <a rel="next" accesskey="n" href="64_002dbit-Guru-Interface.html#g_t64_002dbit-Guru-Interface">64-bit Guru Interface</a>,
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53 Previous: <a rel="previous" accesskey="p" href="Guru-Real_002ddata-DFTs.html#Guru-Real_002ddata-DFTs">Guru Real-data DFTs</a>,
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54 Up: <a rel="up" accesskey="u" href="Guru-Interface.html#Guru-Interface">Guru Interface</a>
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55 <hr>
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56 </div>
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57
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58 <h4 class="subsection">4.5.5 Guru Real-to-real Transforms</h4>
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59
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60 <pre class="example"> fftw_plan fftw_plan_guru_r2r(int rank, const fftw_iodim *dims,
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61 int howmany_rank,
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62 const fftw_iodim *howmany_dims,
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63 double *in, double *out,
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64 const fftw_r2r_kind *kind,
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65 unsigned flags);
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66 </pre>
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67 <p><a name="index-fftw_005fplan_005fguru_005fr2r-258"></a>
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68 Plan a real-to-real (r2r) multi-dimensional <code>FFTW_FORWARD</code>
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69 transform with transform dimensions given by (<code>rank</code>, <code>dims</code>)
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70 over a multi-dimensional vector (loop) of dimensions
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71 (<code>howmany_rank</code>, <code>howmany_dims</code>). <code>dims</code> and
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72 <code>howmany_dims</code> should point to <code>fftw_iodim</code> arrays of length
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73 <code>rank</code> and <code>howmany_rank</code>, respectively.
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74
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75 <p>The transform kind of each dimension is given by the <code>kind</code>
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76 parameter, which should point to an array of length <code>rank</code>. Valid
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77 <code>fftw_r2r_kind</code> constants are given in <a href="Real_002dto_002dReal-Transform-Kinds.html#Real_002dto_002dReal-Transform-Kinds">Real-to-Real Transform Kinds</a>.
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78
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79 <p><code>in</code> and <code>out</code> point to the real input and output arrays; they
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80 may be the same, indicating an in-place transform.
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81
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82 <p><a name="index-flags-259"></a><code>flags</code> is a bitwise OR (‘<samp><span class="samp">|</span></samp>’) of zero or more planner flags,
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83 as defined in <a href="Planner-Flags.html#Planner-Flags">Planner Flags</a>.
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84
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85 <!-- =========> -->
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86 </body></html>
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87
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