d <code>out</code> may be the same, indicating an in-place
transform.   (In-place transforms where <code>in</code> and <code>io</code> or
<code>ii</code> and <code>out</code> are the same are not currently supported.)
</p>
<a name="index-flags-6"></a>
<p><code>flags</code> is a bitwise OR (&lsquo;<samp>|</samp>&rsquo;) of zero or more planner flags,
as defined in <a href="Planner-Flags.html#Planner-Flags">Planner Flags</a>.
</p>
<p>In-place transforms of rank greater than 1 are currently only
supported for 