MATLAB Programming Fundamentals - MathWorks

To add a new category for xlarge, use the addcats function. Since A is ordinal you must

specify the order for the new category.

A = addcats(A,'xlarge','After','large');

Now, assign a value for 'xlarge', since it has an existing category.

A(2) = 'xlarge'

A = 10x1 categorical array

medium

xlarge

small

small

medium

large

medium

large

medium

small

A is now a 10-by-1 categorical array with four categories, such that small < medium <

large < xlarge.

Combine Two Ordinal Categorical Arrays

Create another ordinal categorical array, B, containing the sizes of five items.

B = categorical([2;1;1;2;2],1:2,{'xsmall','small'},'Ordinal',true)

B = 5x1 categorical array

small

xsmall

xsmall

small

small

B is a 5-by-1 categorical array with two categories such that xsmall < small.

To combine two ordinal categorical arrays (which always have protected categories), they

must have the same categories and the categories must be in the same order.

Add the category 'xsmall' to A before the category 'small'.

8 Categorical Arrays