 using <code>FFTW_PATIENT</code>, which is like <code>FFTW_MEASURE</code>
except that it takes more time in order to consider a wider variety of
algorithms.
</p>
<p>For multi-dimensional complex DFTs, instead of <code>fftwnd_create_plan</code>
(or <code>fftw2d_create_plan</code> or <code>fftw3d_create_plan</code>), followed by
<code>fftwnd_one</code>, you would use <code>fftw_plan_dft</code> (or
<code>fftw_plan_dft_2d</code> or <code>fftw_plan_dft_3d</code>).  followed by
<code>fftw_execute</code>.  If you 