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Convert categorical back to integer

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Steven Niggebrugge
Steven Niggebrugge on 22 Dec 2019
Answered: Eric Sofen on 10 Jan 2020
Hi,
i convert an integer to a categorical
a=[-1 0 1]
b=categorical(a)
now how do i convert b back to the same integers in a?
Just can't find the function to do this.
thanks,
steven

  1 Comment

dpb
dpb on 22 Dec 2019
>> str2num(char(b(:)))
ans =
-1
0
1
>>
But, not recommended; the underlying content of a categorical variable aren't really numeric even if they are numbers. The representation internally is an ordered set of the integers 1:N as I'm sure you've already discovered via double()
>> categories(b)
ans =
3×1 cell array
{'-1'}
{'0' }
{'1' }
>>
Gives the values of the categories that make up the unique elements but not the corresponding location in the original array.

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Answers (1)

Eric Sofen
Eric Sofen on 10 Jan 2020
Peter's answer to this similar post provides a few other suggestions to consider.

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