e>hc[k]</code> and its imaginary part in <code>hc[n-k]</code>, with
the exception of <code>k</code> <code>==</code> <code>0</code> or <code>n/2</code> (the latter
only if <code>n</code> is even)&mdash;in these two cases, the imaginary part is
zero due to symmetries of the real-input DFT, and is not stored.
Thus, the r2hc transform of <code>n</code> real values is a halfcomplex array of
length <code>n</code>, and vice versa for hc2r.
<a name="index-normalization-2"></a>
</p>

<p>Aside from the differing form