mirror of
https://github.com/tildearrow/furnace.git
synced 2024-11-15 09:15:06 +00:00
106 lines
5.1 KiB
HTML
106 lines
5.1 KiB
HTML
|
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
|
||
|
|
<html>
|
||
|
|
<!-- This manual is for FFTW
|
||
|
|
(version 3.3.10, 10 December 2020).
|
||
|
|
|
||
|
|
Copyright (C) 2003 Matteo Frigo.
|
||
|
|
|
||
|
|
Copyright (C) 2003 Massachusetts Institute of Technology.
|
||
|
|
|
||
|
|
Permission is granted to make and distribute verbatim copies of this
|
||
|
|
manual provided the copyright notice and this permission notice are
|
||
|
|
preserved on all copies.
|
||
|
|
|
||
|
|
Permission is granted to copy and distribute modified versions of this
|
||
|
|
manual under the conditions for verbatim copying, provided that the
|
||
|
|
entire resulting derived work is distributed under the terms of a
|
||
|
|
permission notice identical to this one.
|
||
|
|
|
||
|
|
Permission is granted to copy and distribute translations of this manual
|
||
|
|
into another language, under the above conditions for modified versions,
|
||
|
|
except that this permission notice may be stated in a translation
|
||
|
|
approved by the Free Software Foundation. -->
|
||
|
|
<!-- Created by GNU Texinfo 6.7, http://www.gnu.org/software/texinfo/ -->
|
||
|
|
<head>
|
||
|
|
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
|
||
|
|
<title>Wisdom File Export/Import from Fortran (FFTW 3.3.10)</title>
|
||
|
|
|
||
|
|
<meta name="description" content="Wisdom File Export/Import from Fortran (FFTW 3.3.10)">
|
||
|
|
<meta name="keywords" content="Wisdom File Export/Import from Fortran (FFTW 3.3.10)">
|
||
|
|
<meta name="resource-type" content="document">
|
||
|
|
<meta name="distribution" content="global">
|
||
|
|
<meta name="Generator" content="makeinfo">
|
||
|
|
<link href="index.html" rel="start" title="Top">
|
||
|
|
<link href="Concept-Index.html" rel="index" title="Concept Index">
|
||
|
|
<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
|
||
|
|
<link href="Accessing-the-wisdom-API-from-Fortran.html" rel="up" title="Accessing the wisdom API from Fortran">
|
||
|
|
<link href="Wisdom-String-Export_002fImport-from-Fortran.html" rel="next" title="Wisdom String Export/Import from Fortran">
|
||
|
|
<link href="Accessing-the-wisdom-API-from-Fortran.html" rel="prev" title="Accessing the wisdom API from Fortran">
|
||
|
|
<style type="text/css">
|
||
|
|
<!--
|
||
|
|
a.summary-letter {text-decoration: none}
|
||
|
|
blockquote.indentedblock {margin-right: 0em}
|
||
|
|
div.display {margin-left: 3.2em}
|
||
|
|
div.example {margin-left: 3.2em}
|
||
|
|
div.lisp {margin-left: 3.2em}
|
||
|
|
kbd {font-style: oblique}
|
||
|
|
pre.display {font-family: inherit}
|
||
|
|
pre.format {font-family: inherit}
|
||
|
|
pre.menu-comment {font-family: serif}
|
||
|
|
pre.menu-preformatted {font-family: serif}
|
||
|
|
span.nolinebreak {white-space: nowrap}
|
||
|
|
span.roman {font-family: initial; font-weight: normal}
|
||
|
|
span.sansserif {font-family: sans-serif; font-weight: normal}
|
||
|
|
ul.no-bullet {list-style: none}
|
||
|
|
-->
|
||
|
|
</style>
|
||
|
|
|
||
|
|
|
||
|
|
</head>
|
||
|
|
|
||
|
|
<body lang="en">
|
||
|
|
<span id="Wisdom-File-Export_002fImport-from-Fortran"></span><div class="header">
|
||
|
|
<p>
|
||
|
|
Next: <a href="Wisdom-String-Export_002fImport-from-Fortran.html" accesskey="n" rel="next">Wisdom String Export/Import from Fortran</a>, Previous: <a href="Accessing-the-wisdom-API-from-Fortran.html" accesskey="p" rel="prev">Accessing the wisdom API from Fortran</a>, Up: <a href="Accessing-the-wisdom-API-from-Fortran.html" accesskey="u" rel="up">Accessing the wisdom API from Fortran</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html" title="Index" rel="index">Index</a>]</p>
|
||
|
|
</div>
|
||
|
|
<hr>
|
||
|
|
<span id="Wisdom-File-Export_002fImport-from-Fortran-1"></span><h4 class="subsection">7.6.1 Wisdom File Export/Import from Fortran</h4>
|
||
|
|
|
||
|
|
<span id="index-fftw_005fimport-wisdom_005ffrom_005ffilename"></span>
|
||
|
|
<span id="index-fftw_005fexport_005fwisdom_005fto_005ffilename-2"></span>
|
||
|
|
<p>The easiest way to export and import wisdom is to do so using
|
||
|
|
<code>fftw_export_wisdom_to_filename</code> and
|
||
|
|
<code>fftw_wisdom_from_filename</code>. The only trick is that these
|
||
|
|
require you to pass a C string, which is an array of type
|
||
|
|
<code>CHARACTER(C_CHAR)</code> that is terminated by <code>C_NULL_CHAR</code>.
|
||
|
|
You can call them like this:
|
||
|
|
</p>
|
||
|
|
<div class="example">
|
||
|
|
<pre class="example"> integer(C_INT) :: ret
|
||
|
|
ret = fftw_export_wisdom_to_filename(C_CHAR_'my_wisdom.dat' // C_NULL_CHAR)
|
||
|
|
if (ret .eq. 0) stop 'error exporting wisdom to file'
|
||
|
|
ret = fftw_import_wisdom_from_filename(C_CHAR_'my_wisdom.dat' // C_NULL_CHAR)
|
||
|
|
if (ret .eq. 0) stop 'error importing wisdom from file'
|
||
|
|
</pre></div>
|
||
|
|
|
||
|
|
<p>Note that prepending ‘<samp>C_CHAR_</samp>’ is needed to specify that the
|
||
|
|
literal string is of kind <code>C_CHAR</code>, and we null-terminate the
|
||
|
|
string by appending ‘<samp>// C_NULL_CHAR</samp>’. These functions return an
|
||
|
|
<code>integer(C_INT)</code> (<code>ret</code>) which is <code>0</code> if an error
|
||
|
|
occurred during export/import and nonzero otherwise.
|
||
|
|
</p>
|
||
|
|
<p>It is also possible to use the lower-level routines
|
||
|
|
<code>fftw_export_wisdom_to_file</code> and
|
||
|
|
<code>fftw_import_wisdom_from_file</code>, which accept parameters of the C
|
||
|
|
type <code>FILE*</code>, expressed in Fortran as <code>type(C_PTR)</code>.
|
||
|
|
However, you are then responsible for creating the <code>FILE*</code>
|
||
|
|
yourself. You can do this by using <code>iso_c_binding</code> to define
|
||
|
|
Fortran intefaces for the C library functions <code>fopen</code> and
|
||
|
|
<code>fclose</code>, which is a bit strange in Fortran but workable.
|
||
|
|
</p>
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
</body>
|
||
|
|
</html>
|