How can I count the frequency of each element of one vector?

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Hi,I have this code which gives the number of occurrences of each element of w vector in vector y
a= [7 4 9 6 4 10 9 6 7 6]
y=zeros(size(a));
for i=1:length(a)
y(i)=sum(a==a(i));
end
y = y;
end
y=[2 2 2 3 2 1 2 3 2 3]
but this result is not enough because I need to know the index along with the number of repartitions.
the result should look like:
element no of repartitions position1 position2 position3
7 2 1 9 0
4 2 2 5 0
9 2 3 7 0
6 3 4 8 10
10 1 0 0 0

Answers (1)

Azzi Abdelmalek
Azzi Abdelmalek on 12 Apr 2014
Edited: Azzi Abdelmalek on 12 Apr 2014
a= [7 4 9 6 4 10 9 6 7 6]
[b,idx]=unique(a)
[~,jdx]=sort(idx);
[ii,jj]=histc(a,b)
d=accumarray(jj',(1:numel(jj))',[],@(x) {[x' zeros(1,max(ii)-numel(x))]})
out=[b' ii' cell2mat(d)]
out=out(jdx,:)

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