i've a matrix of 6x4 and i want to count the rows how many times it occur in a matrix

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Raman
Raman 2013-5-8
编辑： Jan 2017-8-9
let say the matrix is
A=[ 12 45 67 89
34 56 78 65
12 45 67 89
53 55 21 90
12 45 67 89
53 55 21 90 ]
i want the output to be as:
12 45 67 89 ----- 3 % because it occurs 3 times
34 56 78 65 ------1
53 55 21 90 ------2
plz help me

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采纳的回答

Azzi Abdelmalek
Azzi Abdelmalek 2013-5-8
A=[ 12 45 67 89
34 56 78 65
12 45 67 89
53 55 21 90
12 45 67 89
53 55 21 90 ]
[a,b,c]=unique(A,'rows','stable');
v=arrayfun(@(x) sum(c==x),1:size(a,1))';
out=[a v]
  2 个评论
Emma Cairns
Emma Cairns 2017-8-9
I have an instance where I need to do this twice with two separate matrices and I keep getting the same output for both using this code, is there any way I can make it work? Thanks!
Jan
Jan 2017-8-9
编辑：Jan 2017-8-9
@Emma: Yes, there is a way. Of course there is. If you post the relevant part of your code (preferably as a new question and not by high-jacking this thread), we can even suggest a solution.
Andrei's method is slightly faster and (c)leaner.

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更多回答（1 个）

Andrei Bobrov
Andrei Bobrov 2013-5-8
A=[ 12 45 67 89
34 56 78 65
12 45 67 89
53 55 21 90
12 45 67 89
53 55 21 90 ];
[a,c,c] = unique(A,'rows');
out = [a, histc(c,1:max(c))];

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