Problem with categorical arrays

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I have a problem with the categorical function. Some variables of my problem are of the following type (It is a reduced form of my problem):
I want to convert it to a categorical array but the categorical function gives me the following error:
Error using categorical (line 321)
Could not find unique values in DATA using the UNIQUE function.
Caused by:
Error using cell/unique (line 85)
Input A must be a cell array of strings.
This is the code I use for convert it in a categorical array.
VarA.VarA = categorical(VarA.VarA);
  5 Comments
Manuel Valenciano
Manuel Valenciano on 8 Jun 2016
Thank you for your answer

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Accepted Answer

Jan Orwat
Jan Orwat on 11 Jun 2016
(Copied from comments as suggested.)
You are trying to make categorical array from a variable of mixed data types.
categorical([1 2 3 5 2 1])
categorical({'str1' 'str2'})
works, but
categorical({'str1' 'str2' 1 3 2 1})
does not. It works the same way for tables. Check categorical documentation for more information.
To solve this problem you may change numerical data to strings.

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