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Add FFTW 3.3.8 source, and a Linux build
author Chris Cannam <cannam@all-day-breakfast.com>
date Tue, 19 Nov 2019 14:52:55 +0000
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1 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
2 <html>
3 <!-- This manual is for FFTW
4 (version 3.3.8, 24 May 2018).
5
6 Copyright (C) 2003 Matteo Frigo.
7
8 Copyright (C) 2003 Massachusetts Institute of Technology.
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10 Permission is granted to make and distribute verbatim copies of this
11 manual provided the copyright notice and this permission notice are
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14 Permission is granted to copy and distribute modified versions of this
15 manual under the conditions for verbatim copying, provided that the
16 entire resulting derived work is distributed under the terms of a
17 permission notice identical to this one.
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19 Permission is granted to copy and distribute translations of this manual
20 into another language, under the above conditions for modified versions,
21 except that this permission notice may be stated in a translation
22 approved by the Free Software Foundation. -->
23 <!-- Created by GNU Texinfo 6.3, http://www.gnu.org/software/texinfo/ -->
24 <head>
25 <title>FFTW 3.3.8: Wisdom Import</title>
26
27 <meta name="description" content="FFTW 3.3.8: Wisdom Import">
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33 <link href="index.html#Top" rel="start" title="Top">
34 <link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index">
35 <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
36 <link href="Wisdom.html#Wisdom" rel="up" title="Wisdom">
37 <link href="Forgetting-Wisdom.html#Forgetting-Wisdom" rel="next" title="Forgetting Wisdom">
38 <link href="Wisdom-Export.html#Wisdom-Export" rel="prev" title="Wisdom Export">
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65 </style>
66
67
68 </head>
69
70 <body lang="en">
71 <a name="Wisdom-Import"></a>
72 <div class="header">
73 <p>
74 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>
75 </div>
76 <hr>
77 <a name="Wisdom-Import-1"></a>
78 <h4 class="subsection">4.7.2 Wisdom Import</h4>
79
80 <div class="example">
81 <pre class="example">int fftw_import_system_wisdom(void);
82 int fftw_import_wisdom_from_filename(const char *filename);
83 int fftw_import_wisdom_from_string(const char *input_string);
84 int fftw_import_wisdom(int (*read_char)(void *), void *data);
85 </pre></div>
86 <a name="index-fftw_005fimport_005fwisdom"></a>
87 <a name="index-fftw_005fimport_005fsystem_005fwisdom-1"></a>
88 <a name="index-fftw_005fimport_005fwisdom_005ffrom_005ffilename-1"></a>
89 <a name="index-fftw_005fimport_005fwisdom_005ffrom_005ffile"></a>
90 <a name="index-fftw_005fimport_005fwisdom_005ffrom_005fstring"></a>
91
92 <p>These functions import wisdom into a program from data stored by the
93 <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
94 already accumulated by the running program.
95 </p>
96 <p><code>fftw_import_wisdom</code> imports wisdom from any input medium, as
97 specified by the callback function <code>read_char</code>. <code>read_char</code> is
98 a <code>getc</code>-like function that returns the next character in the
99 input; its parameter is the <code>data</code> pointer passed to
100 <code>fftw_import_wisdom</code>. If the end of the input data is reached
101 (which should never happen for valid data), <code>read_char</code> should
102 return <code>EOF</code> (as defined in <code>&lt;stdio.h&gt;</code>). For convenience,
103 the following three &ldquo;wrapper&rdquo; routines are provided:
104 </p>
105 <p><code>fftw_import_wisdom_from_filename</code> reads wisdom from a file named
106 <code>filename</code>. A lower-level function, which requires you to open
107 and close the file yourself (e.g. if you want to read wisdom from a
108 portion of a larger file) is <code>fftw_import_wisdom_from_file</code>. This
109 reads wisdom from the current position in <code>input_file</code> (which
110 should be open with read permission); upon exit, the file remains
111 open, but the position of the read pointer is unspecified.
112 </p>
113 <p><code>fftw_import_wisdom_from_string</code> reads wisdom from the
114 <code>NULL</code>-terminated string <code>input_string</code>.
115 </p>
116 <p><code>fftw_import_system_wisdom</code> reads wisdom from an
117 implementation-defined standard file (<code>/etc/fftw/wisdom</code> on Unix
118 and GNU systems).
119 <a name="index-wisdom_002c-system_002dwide-1"></a>
120 </p>
121
122 <p>The return value of these import routines is <code>1</code> if the wisdom was
123 read successfully and <code>0</code> otherwise. Note that, in all of these
124 functions, any data in the input stream past the end of the wisdom data
125 is simply ignored.
126 </p>
127 <hr>
128 <div class="header">
129 <p>
130 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>
131 </div>
132
133
134
135 </body>
136 </html>