mirror of
https://github.com/tildearrow/furnace.git
synced 2024-12-20 23:40:23 +00:00
111 lines
4.9 KiB
HTML
111 lines
4.9 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 of Fortran? (FFTW 3.3.10)</title>
|
|
|
|
<meta name="description" content="Wisdom of Fortran? (FFTW 3.3.10)">
|
|
<meta name="keywords" content="Wisdom of 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="Calling-FFTW-from-Legacy-Fortran.html" rel="up" title="Calling FFTW from Legacy Fortran">
|
|
<link href="Upgrading-from-FFTW-version-2.html" rel="next" title="Upgrading from FFTW version 2">
|
|
<link href="Fortran-Examples.html" rel="prev" title="Fortran Examples">
|
|
<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-of-Fortran_003f"></span><div class="header">
|
|
<p>
|
|
Previous: <a href="Fortran-Examples.html" accesskey="p" rel="prev">Fortran Examples</a>, Up: <a href="Calling-FFTW-from-Legacy-Fortran.html" accesskey="u" rel="up">Calling FFTW from Legacy 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-of-Fortran_003f-1"></span><h3 class="section">8.5 Wisdom of Fortran?</h3>
|
|
|
|
<p>In this section, we discuss how one can import/export FFTW wisdom
|
|
(saved plans) to/from a Fortran program; we assume that the reader is
|
|
already familiar with wisdom, as described in <a href="Words-of-Wisdom_002dSaving-Plans.html">Words of Wisdom-Saving Plans</a>.
|
|
</p>
|
|
<span id="index-portability-8"></span>
|
|
<p>The basic problem is that is difficult to (portably) pass files and
|
|
strings between Fortran and C, so we cannot provide a direct Fortran
|
|
equivalent to the <code>fftw_export_wisdom_to_file</code>, etcetera,
|
|
functions. Fortran interfaces <em>are</em> provided for the functions
|
|
that do not take file/string arguments, however:
|
|
<code>dfftw_import_system_wisdom</code>, <code>dfftw_import_wisdom</code>,
|
|
<code>dfftw_export_wisdom</code>, and <code>dfftw_forget_wisdom</code>.
|
|
<span id="index-dfftw_005fimport_005fsystem_005fwisdom"></span>
|
|
<span id="index-dfftw_005fimport_005fwisdom"></span>
|
|
<span id="index-dfftw_005fexport_005fwisdom"></span>
|
|
<span id="index-dfftw_005fforget_005fwisdom"></span>
|
|
</p>
|
|
|
|
<p>So, for example, to import the system-wide wisdom, you would do:
|
|
</p>
|
|
<div class="example">
|
|
<pre class="example"> integer isuccess
|
|
call dfftw_import_system_wisdom(isuccess)
|
|
</pre></div>
|
|
|
|
<p>As usual, the C return value is turned into a first parameter;
|
|
<code>isuccess</code> is non-zero on success and zero on failure (e.g. if
|
|
there is no system wisdom installed).
|
|
</p>
|
|
<p>If you want to import/export wisdom from/to an arbitrary file or
|
|
elsewhere, you can employ the generic <code>dfftw_import_wisdom</code> and
|
|
<code>dfftw_export_wisdom</code> functions, for which you must supply a
|
|
subroutine to read/write one character at a time. The FFTW package
|
|
contains an example file <code>doc/f77_wisdom.f</code> demonstrating how to
|
|
implement <code>import_wisdom_from_file</code> and
|
|
<code>export_wisdom_to_file</code> subroutines in this way. (These routines
|
|
cannot be compiled into the FFTW library itself, lest all FFTW-using
|
|
programs be required to link with the Fortran I/O library.)
|
|
</p>
|
|
|
|
|
|
</body>
|
|
</html>
|