#### 8.2.6.21 categorical.undefined ¶

Static Method: `out =` categorical.undefined `()` ¶
Static Method: `out =` categorical.undefined `(sz)` ¶

  Create an array of undefined categoricals.

  Creates a categorical array whose elements are all <undefined>.

  sz is the size of the array to create. If omitted or empty, creates a scalar.

  Returns a categorical array.

  See also: categorical.missing