0 个投票

Dear All;
I have an array of two columns, I want to find each repeated values of y for each x value and then the max of these y value to this x value and make new matrix in which for each x value there is a unique y value
how to do that ?

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Walter Roberson
Walter Roberson 2014-3-6
What do you want done if one of the y values is unique instead of being repeated?

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Walter Roberson
Walter Roberson 2014-3-6

0 个投票

[uvals, ua, uc] = unique(xy(:,1));
maxy = accumarray(uc(:), xy(:,2), [], @max);
newarray = [uvals(:), maxy(:)];

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Azzi Abdelmalek
Azzi Abdelmalek 2014-3-6

0 个投票

v=[1 2;1 3;4 5;4 20;10 30]
[ii,jj,kk]=unique(v(:,1))
out=[ii accumarray(kk,v(:,2),[],@max)]

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