Random pick data by label

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Hg
Hg 2015-8-7
编辑： Azzi Abdelmalek 2015-8-7
I have a data array (13x5). The last column is the class (1-4) of each data. How do I randomly pick n-number of data from each class? Let say 2 data from each class.

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Azzi Abdelmalek
Azzi Abdelmalek 2015-8-7
编辑：Azzi Abdelmalek 2015-8-7
A=[randi(9,100,4) randi([1 4],100,1)] % Example
[ii,jj,kk]=unique(A(:,5))
m=accumarray(kk,(1:numel(kk))',[],@(x) {x'})
out=cell2mat(cellfun(@(x) A(x(randperm(numel(x),2)),:),m,'un',0))

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