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I want to count the frequency of the similar rows in a very long matrix. I have one million rows. I want something like below,
I have a matrix like below,
[0 0 0 0
0 0 0 0
0 0 0 1
0 0 0 1
0 0 0 1
0 0 0 2
0 0 0 2]
And I am looking for an output like below,
[0 0 0 0 2
0 0 0 1 3
0 0 0 2 2]
Thanks

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Andrei Bobrov
Andrei Bobrov le 13 Sep 2018
Modifié(e) : Andrei Bobrov le 13 Sep 2018

1 vote

a = [0 0 0 0
0 0 0 0
0 0 0 1
0 0 0 1
0 0 0 1
0 0 0 2
0 0 0 2];
[aa,~,c] = unique(a,'rows');
out = [aa, histcounts(c,1:max(c)+1)'];

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