categorical

Methods

⌂ categorical

Method Reference: categorical.removecats

categorical: B = removecats (A)
categorical: B = removecats (A, oldcats)

Remove categories from categorical array.

B = removecats (A) removes all unused categories from categorical array A. The output categorical array B has the same size and values as A, but potentially fewer categories.

B = removecats (A, oldcats) removes the categories specified by oldcats. The elements of B that correspond to the removed categories are undefined.

oldcats can be a string array, a cell array of character vectors, or any type of array that can be converted to a cell array of character vectors with the cellstr function. Any names in oldcats that do not reference an existing category are ignored.

When removing a single category, oldcats can also be specified as a character vector.

Source Code: categorical

Example: 1

removecats drops categories from an array.

 C = categorical ({'S'; 'M'; 'S'}, {'S', 'M', 'L'})
C =
  3x1 categorical array

    S    
    M    
    S

Naming a category removes it and turns its elements into <undefined>.

 removecats (C, 'M')
ans =
  3x1 categorical array

    S              
    <undefined>    
    S

With no list only the unused categories go (values unchanged) — here the unused L disappears from the category list.

 categories (removecats (C))
ans =
  2x1 cell array

    {'S'}    
    {'M'}