How to determine if elements in a column are negative

2013 3 22
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I am developing a program for a class project to determine the states for a petri net. It will use the basic algorithm for a coverability tree. One of the first steps is determining the firability of a transition, and I would need to determine if any of the elements in a column of a matrix is negative. I looked through the function list and didn't see anything that would apply.
Any suggestions for either the column logic or petri net in general would be appreciated.
Thanks

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Dave
Dave 2013-3-22
It can vary, but the one I am currently using is 12x12 (doesn't have to be square)

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Azzi Abdelmalek
Azzi Abdelmalek 2013-3-22
编辑：Azzi Abdelmalek 2013-3-22

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any(A(:,3)<0) % find if any of column 3 of matrix A is negative

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Dave
Dave 2013-3-22
Thanks, where can I find some of this information? I would like to be able to find it myself if possible. Thanks again for your time & help

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vipul utsav
vipul utsav 2013-3-22

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[ind1 ind2]=find(matrix<0); matrixneg=matrix(ind1,ind2);

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