 <code>n</code> is a pointer to an array <code>n[rank]</code> denoting an
<code>n[0]</code> by <code>n[1]</code> by &hellip; by <code>n[rank-1]</code> transform.
Thus, for example, the call
</p><div class="example">
<pre class="example">fftw_plan_dft_2d(n0, n1, in, out, sign, flags);
</pre></div>
<p>is equivalent to the following code fragment:
</p><div class="example">
<pre class="example">int n[2];
n[0] = n0;
n[1] = n1;
fftw_plan_dft(2, n, in, out, sign, flags);
</pre></div>
<p><code>fftw_plan_dft</code> 