`countcats`

Number of elements in each category of a categorical array.

Category: Language Fundamentals > Data Types

Syntax

N = countcats(C)

Counts elements per category, along the first non-singleton dimension.

N = countcats(C, dim)

Counts along dimension dim.

Description

Categories with no elements are reported with 0. Undefined elements are not counted. The order of N follows categories(C), so the two outputs can be displayed side by side.

Input arguments

C: categorical array.
dim: Dimension to count along.

Output arguments

N: Counts in category order. For a vector, one number per category.

Example

Counting labels

c = categorical({'a','b','a','c'});
categories(c)'
countcats(c)

Output

ans = 1×3 cell

    {'a'}    {'b'}    {'c'}
ans = 1×3

     2     1     1

countcats