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Finding the Frequency of Unique Values

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Rightia Rollmann
Rightia Rollmann on 13 Aug 2016
Edited: Azzi Abdelmalek on 13 Aug 2016
How to return the frequency of each value in array A? (So, B views there are 3, 1, 4, and 2 of 1, 2, 3, and 4, respectively)
A = [ 1 1 4 3 3 3 3 2 4 1 ]
B = [ 3 1 4 2]

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Accepted Answer

Azzi Abdelmalek
Azzi Abdelmalek on 13 Aug 2016
Edited: Azzi Abdelmalek on 13 Aug 2016
A = [ 1 1 4 3 3 3 3 2 4 1 ]
[ii,jj,kk]=unique(A)
freq=accumarray(kk,1)
out=[ii' freq]
%or
freq=hist(A,1:4)

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