# How to find a specific row in a matrix and eliminate it?

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kyana shayan 2015년 12월 9일
댓글: Guillaume 2015년 12월 9일
Hi everyone, I have a matrix such as this: D0=[1 2;1 4;2 1;3 5;4 1;5 3]. I need to eliminate one of the two rows with same elements. for example, 1 & 2 both involve in rows one and three, so I need to eliminate one of these rows. can any one please help me?

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Guillaume 2015년 12월 9일
It looks like you don't care about the ordering of the columns. In that case, it's extremely simple: a) sort the rows (so that [2 1] becomes [1 2]) and b) use unique to remove duplicates
D0 = [1 2;1 4;2 1;3 5;4 1;5 3]
uniquerows = unique(sort(D0, 2), 'rows', 'stable')
%if you don't care about the rows ordering you can omit the 'stable'
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Guillaume 2015년 12월 9일
Simply use the second return value of unique to get the indices of the rows that have been kept. Use those indices to get the actual rows:
D0 = [1 2 4;1 4 3;2 1 4;3 5 2;4 1 3;5 3 2]
[~, rowindices] = unique(sort(D0, 2), 'rows'); %'stable' optional
uniquerows = D0(rowindices, :)

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