How to determine if elements in a column are negative

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

[vipul utsav]

what is size of matrix?

[Dave]

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

Answer 1

[Azzi Abdelmalek]

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

[Dave]

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

[Azzi Abdelmalek]

help any

Matrix-Indexing

Answer 2

[vipul utsav]

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