_forget_wisdom</code> after
every planner call.)
</p>
<p>The FFTW 3 wisdom import/export routines are almost the same as before
(although the storage format is entirely different).  There is one
significant difference, however.  In FFTW 2, the import routines would
never read past the end of the wisdom, so you could store extra data
beyond the wisdom in the same file, for example.  In FFTW 3, the
file-import routine may read up to a few hundred bytes past the end of
the wisdom, so you cannot store other dat