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How to erase data from a matrix from the command line?

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Emerson De Souza
Emerson De Souza 2012-10-26
INTRO: Hi, I have a matrix Mij and would like to erase the rows i whenever the row-value of two columns are identical (for example:Mi2=Mi3)
Example:
M=3 1.2 13 2
1.2 0.3 0.3 10
10 2 1 0
0.7 5 3 0.4
The new matrix
Nij= 3 1.2 13 2
10 2 1 0
0.7 5 3 0.4
I wonder if someone could help me how to solve this issue
Thanks in advance
Emerson

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Matt Fig
Matt Fig 2012-10-26
M=[3 1.2 13 2
1.2 0.3 0.3 10
10 2 1 0
0.7 5 3 0.4];
Nij = M(all(diff(sort(M,2),[],2),2),:)
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Matt Fig
Matt Fig 2012-10-26
Same idea:
M = [1 2 3 4;5 6 7 8;1 2 3 3;6 7 8 9;3 4 5 5];
M(~diff(M(:,3:4),[],2),:) = []
Emerson De Souza
Emerson De Souza 2012-10-26
Now I got it, thank you for your attention
Wish you a nice night
Emerson

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