 added to the array).
</p>
<p>In addition to the categories defined in the array, a categorical array
may have elements of &quot;undefined&quot; value. This is not considered a
category; rather, it is the absence of any known value. It is
analagous to a <code class="code">NaN</code> value.
</p>
<p>This class is not fully implemented yet. Missing stuff:
  - gt, ge, lt, le
  - Ordinal support in general
  - countcats
  - summary
</p>
</dd></dl>

<dl class="first-deftypecv first-deftypeivar-alias-first-deftype