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FFTW. It is preferable to create wisdom directly from your executable
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(see <a href="Caveats-in-Using-Wisdom.html#Caveats-in-Using-Wisdom">Caveats in Using Wisdom</a>), but this program is useful for
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creating global wisdom files for <code>fftw_import_system_wisdom</code>.
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file as input and produces a <dfn>configuration routine</dfn> as output. The
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latter is a C subroutine that you can compile and link into your
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program, replacing a routine of the same name in the FFTW library, that