categorical.categories
categorical: cstr = categories (C)
List of categories in categorical array.
cstr = categories (C) returns a cell array of
character vectors with the names of the categories in C.
Source Code: categorical
categories lists an array's categories — the full declared label set, not merely the values that happen to be present.
C = categorical ({'M'; 'S'; 'M'}, {'S', 'M', 'L'}, 'Ordinal', true)
C =
3x1 categorical array
M
S
M
categories (C)
ans =
3x1 cell array
{'S'}
{'M'}
{'L'}
L is a declared category (and, being ordinal, keeps its place in the order) even though no element currently takes that value.