How to calculate number of times a pair appear in an array

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Ray
Ray 2015-9-4
回答： Ray 2015-9-4
Let's say I have an array as such:
X and Y is the original data, and I hope to find Z, which is the number of times the pair X&Y occurs in the array.
eg. X=1 & Y=2 occurs 2 times X=1 & Y=3 occurs 2 times X=2 & Y=1 occurs 3 times X=2 & Y=2 occurs 1 times
This is just a simple example, my real data is in random order, but the idea is the same, how to get the number of times both elements X&Y pair occurs and save in in XYZ array?

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采纳的回答

Azzi Abdelmalek
Azzi Abdelmalek 2015-9-4
data=[1 2;4 5;1 2;7 8;1 2;4 5]
[ii,jj,kk]=unique(data,'rows')
out=[ii histc(kk,1:size(ii,1))]

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Ray
Ray 2015-9-4
Thank you for the very quick reply. You've made my life so much easier. Thank you again!!

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