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# removing specifics elements from a matrix

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giuseppe insignito on 26 Nov 2020
Commented: Stephen Cobeldick on 26 Nov 2020
I have the following matrix
acomb_w =
1 1
2 1
3 1
4 1
1 2
2 2
3 2
4 2
1 3
2 3
3 3
4 3
1 4
2 4
3 4
4 4
I need to get rid, automatically, of all the rows with doubles, so that:
acomb_w =
2 1
3 1
4 1
1 2
3 2
4 2
1 3
2 3
4 3
1 4
2 4
3 4
Can anyone help me?
Thanks!

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### Accepted Answer

Stephen Cobeldick on 26 Nov 2020
Edited: Stephen Cobeldick on 26 Nov 2020
acomb_w = [...
1 1
2 1
3 1
4 1
1 2
2 2
3 2
4 2
1 3
2 3
3 3
4 3
1 4
2 4
3 4
4 4];
acomb_w(~diff(acomb_w,1,2),:) = []
acomb_w = 12×2
2 1 3 1 4 1 1 2 3 2 4 2 1 3 2 3 4 3 1 4
... some rows truncated here

#### 2 Comments

giuseppe insignito on 26 Nov 2020
It worked! Even if I don't get what happen exactly...
Stephen Cobeldick on 26 Nov 2020
@giuseppe insignito : I'm glad. Please remember to accept my answer!

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