out = NaC () ¶out = NaC (sz) ¶“Not-a-Categorical". Creates missing-valued categorical arrays.
Returns a new categorical array of all missing values of
the given size. If no input sz is given, the result is a scalar missing
categorical.
NaC is the categorical equivalent of NaN or NaT. It
represents a missing, invalid, or null value. NaC values never compare
equal to any value, including other NaCs.
NaC is a convenience function which is strictly a wrapper around
categorical.undefined and returns the same results, but may be more convenient
to type and/or more readable, especially in array expressions with several values.
See also: categorical.undefined