classify a matrix according to a "flag" value

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George
George 2013-11-19
编辑： George 2013-11-19
Hello
I have a rather large matrix with 3 columns and several thousand rows (!) (1000000x3)
As example
c1 c2 c3
r1 10 -5 0
r2 20 -10 1
.. ... ... 0
rn 100 -1 0
I would like to set as my criterion the third column, if the number is 0 then collect all the information from the other two column and create a new matrix.
c1 c2 c3
r1 10 -5 0
r2 ... ... 0
rn 100 -1 0
any suggestions? thank you very much

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采纳的回答

Azzi Abdelmalek
Azzi Abdelmalek 2013-11-19
out=A(A(:,3)==0,:)
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George
George 2013-11-19
编辑：George 2013-11-19
thanks very much for the answer
I played around a bit and did this, perhaps it may be ok as well ?
d(:,3)==0
A=find(d(:,3)==0);
d1=d(A,1:2);

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