Delete rows with same elements
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a=[2 3 2;3 3 3;4 4 4;2 5 4; 3 5 5; 4 4 4; 7 3 4]
how do I delete only those rows where elemets repeat for entire row length. In this example matrix, the three rows with all 3s and all 4s where this happens.
采纳的回答
Star Strider
2018-11-25
Try this:
a=[2 3 2;3 3 3;4 4 4;2 5 4; 3 5 5; 4 4 4; 7 3 4];
a_new = a(all(diff(a,[],2) ~= 0, 2),:)
If all the columns in a particular row are the same, the vector returned by the diff function will all be uniformly 0. The all function across rows (dimension = 2) detects that, and deletes those rows.
a =
2 3 2
3 3 3
4 4 4
2 5 4
3 5 5
4 4 4
7 3 4
a_new =
2 3 2
2 5 4
7 3 4
更多回答（1 个）
Walter Roberson
2018-11-25
mask = all(diff(a, [], 2) == 0)
Now you can use mask as the row selector in deletion.
1 个评论
Walter Roberson
2018-11-26
a(mask,:) = [];
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