ction to execute the transform with multiplicity
(<code>howmany</code>) and stride parameters, you would now use the advanced
interface <code>fftw_plan_many_dft</code> to specify those parameters.  The
plans are now executed with <code>fftw_execute(plan)</code>, which takes all
of its parameters (including the input/output arrays) from the plan.
</p>
<p>In-place transforms no longer interpret their output argument as scratch
space, nor is there an <code>FFTW_IN_PLACE</code> flag.  You simply pass the
same p