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Current fftw source
author Chris Cannam <cannam@all-day-breakfast.com>
date Tue, 18 Oct 2016 13:40:26 +0100
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cannam@127 3 <!-- This manual is for FFTW
cannam@127 4 (version 3.3.5, 30 July 2016).
cannam@127 5
cannam@127 6 Copyright (C) 2003 Matteo Frigo.
cannam@127 7
cannam@127 8 Copyright (C) 2003 Massachusetts Institute of Technology.
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cannam@127 10 Permission is granted to make and distribute verbatim copies of this
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cannam@127 24 <head>
cannam@127 25 <title>FFTW 3.3.5: Wisdom Import</title>
cannam@127 26
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cannam@127 35 <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
cannam@127 36 <link href="Wisdom.html#Wisdom" rel="up" title="Wisdom">
cannam@127 37 <link href="Forgetting-Wisdom.html#Forgetting-Wisdom" rel="next" title="Forgetting Wisdom">
cannam@127 38 <link href="Wisdom-Export.html#Wisdom-Export" rel="prev" title="Wisdom Export">
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cannam@127 69 </head>
cannam@127 70
cannam@127 71 <body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
cannam@127 72 <a name="Wisdom-Import"></a>
cannam@127 73 <div class="header">
cannam@127 74 <p>
cannam@127 75 Next: <a href="Forgetting-Wisdom.html#Forgetting-Wisdom" accesskey="n" rel="next">Forgetting Wisdom</a>, Previous: <a href="Wisdom-Export.html#Wisdom-Export" accesskey="p" rel="prev">Wisdom Export</a>, Up: <a href="Wisdom.html#Wisdom" accesskey="u" rel="up">Wisdom</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
cannam@127 76 </div>
cannam@127 77 <hr>
cannam@127 78 <a name="Wisdom-Import-1"></a>
cannam@127 79 <h4 class="subsection">4.7.2 Wisdom Import</h4>
cannam@127 80
cannam@127 81 <div class="example">
cannam@127 82 <pre class="example">int fftw_import_system_wisdom(void);
cannam@127 83 int fftw_import_wisdom_from_filename(const char *filename);
cannam@127 84 int fftw_import_wisdom_from_string(const char *input_string);
cannam@127 85 int fftw_import_wisdom(int (*read_char)(void *), void *data);
cannam@127 86 </pre></div>
cannam@127 87 <a name="index-fftw_005fimport_005fwisdom"></a>
cannam@127 88 <a name="index-fftw_005fimport_005fsystem_005fwisdom-1"></a>
cannam@127 89 <a name="index-fftw_005fimport_005fwisdom_005ffrom_005ffilename-1"></a>
cannam@127 90 <a name="index-fftw_005fimport_005fwisdom_005ffrom_005ffile"></a>
cannam@127 91 <a name="index-fftw_005fimport_005fwisdom_005ffrom_005fstring"></a>
cannam@127 92
cannam@127 93 <p>These functions import wisdom into a program from data stored by the
cannam@127 94 <code>fftw_export_wisdom</code> functions above. (See <a href="Words-of-Wisdom_002dSaving-Plans.html#Words-of-Wisdom_002dSaving-Plans">Words of Wisdom-Saving Plans</a>.) The imported wisdom replaces any wisdom
cannam@127 95 already accumulated by the running program.
cannam@127 96 </p>
cannam@127 97 <p><code>fftw_import_wisdom</code> imports wisdom from any input medium, as
cannam@127 98 specified by the callback function <code>read_char</code>. <code>read_char</code> is
cannam@127 99 a <code>getc</code>-like function that returns the next character in the
cannam@127 100 input; its parameter is the <code>data</code> pointer passed to
cannam@127 101 <code>fftw_import_wisdom</code>. If the end of the input data is reached
cannam@127 102 (which should never happen for valid data), <code>read_char</code> should
cannam@127 103 return <code>EOF</code> (as defined in <code>&lt;stdio.h&gt;</code>). For convenience,
cannam@127 104 the following three &ldquo;wrapper&rdquo; routines are provided:
cannam@127 105 </p>
cannam@127 106 <p><code>fftw_import_wisdom_from_filename</code> reads wisdom from a file named
cannam@127 107 <code>filename</code>. A lower-level function, which requires you to open
cannam@127 108 and close the file yourself (e.g. if you want to read wisdom from a
cannam@127 109 portion of a larger file) is <code>fftw_import_wisdom_from_file</code>. This
cannam@127 110 reads wisdom from the current position in <code>input_file</code> (which
cannam@127 111 should be open with read permission); upon exit, the file remains
cannam@127 112 open, but the position of the read pointer is unspecified.
cannam@127 113 </p>
cannam@127 114 <p><code>fftw_import_wisdom_from_string</code> reads wisdom from the
cannam@127 115 <code>NULL</code>-terminated string <code>input_string</code>.
cannam@127 116 </p>
cannam@127 117 <p><code>fftw_import_system_wisdom</code> reads wisdom from an
cannam@127 118 implementation-defined standard file (<code>/etc/fftw/wisdom</code> on Unix
cannam@127 119 and GNU systems).
cannam@127 120 <a name="index-wisdom_002c-system_002dwide-1"></a>
cannam@127 121 </p>
cannam@127 122
cannam@127 123 <p>The return value of these import routines is <code>1</code> if the wisdom was
cannam@127 124 read successfully and <code>0</code> otherwise. Note that, in all of these
cannam@127 125 functions, any data in the input stream past the end of the wisdom data
cannam@127 126 is simply ignored.
cannam@127 127 </p>
cannam@127 128 <hr>
cannam@127 129 <div class="header">
cannam@127 130 <p>
cannam@127 131 Next: <a href="Forgetting-Wisdom.html#Forgetting-Wisdom" accesskey="n" rel="next">Forgetting Wisdom</a>, Previous: <a href="Wisdom-Export.html#Wisdom-Export" accesskey="p" rel="prev">Wisdom Export</a>, Up: <a href="Wisdom.html#Wisdom" accesskey="u" rel="up">Wisdom</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
cannam@127 132 </div>
cannam@127 133
cannam@127 134
cannam@127 135
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