FT</a>.  Likewise, FFTW&rsquo;s multidimensional
<code>FFTW_DHT</code> r2r transform is not the same thing as the logical
multi-dimensional discrete Hartley transform defined in the literature,
as discussed in <a href="The-Discrete-Hartley-Transform.html#The-Discrete-Hartley-Transform">The Discrete Hartley Transform</a>.
</p>
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