Create ordinal array

After creating an `ordinal`

array,
you can use related functions to add, drop, or merge categories, and
more.

For more information, see Using ordinal Objects.

The `nominal`

and `ordinal`

array
data types might be removed in a future release. To represent ordered
and unordered discrete, nonnumeric data, use the MATLAB^{®} `categorical`

data type instead.

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