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Add FFTW3
author Chris Cannam
date Wed, 20 Mar 2013 15:35:50 +0000
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+<html lang="en">
+<head>
+<title>Wisdom of Fortran? - FFTW 3.3.3</title>
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+<div class="node">
+<a name="Wisdom-of-Fortran%3f"></a>
+<a name="Wisdom-of-Fortran_003f"></a>
+<p>
+Previous:&nbsp;<a rel="previous" accesskey="p" href="Fortran-Examples.html#Fortran-Examples">Fortran Examples</a>,
+Up:&nbsp;<a rel="up" accesskey="u" href="Calling-FFTW-from-Legacy-Fortran.html#Calling-FFTW-from-Legacy-Fortran">Calling FFTW from Legacy Fortran</a>
+<hr>
+</div>
+
+<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_002dSaving-Plans">Words of Wisdom-Saving Plans</a>.
+
+   <p><a name="index-portability-598"></a>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>. 
+<a name="index-dfftw_005fimport_005fsystem_005fwisdom-599"></a><a name="index-dfftw_005fimport_005fwisdom-600"></a><a name="index-dfftw_005fexport_005fwisdom-601"></a><a name="index-dfftw_005fforget_005fwisdom-602"></a>
+
+   <p>So, for example, to import the system-wide wisdom, you would do:
+
+<pre class="example">             integer isuccess
+             call dfftw_import_system_wisdom(isuccess)
+</pre>
+   <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>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.)
+
+   </body></html>
+