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Matching two matrices by sign

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A=[1,1,-3;2,-1,4];
B=[2,4,-2; 2,-1,-3];
How can I get that the sign of B(2,3) is different than the sign of A(2,3)? i.e. the signs of A and B should be the same. I want to find if I have any observation in B that doesn't match the sign of the respective value in A;

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Accepted Answer

Azzi Abdelmalek
Azzi Abdelmalek on 4 Aug 2013
Edited: Azzi Abdelmalek on 4 Aug 2013
sign(B(2,3))==sign(A(2,3))
For the whole matrices
A=[1,1,-3;2,-1,4];
B=[2,4,-2; 2,-1,-3];
[ii,jj]=find(sign(A)==sign(B))

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Cedric Wannaz
Cedric Wannaz on 4 Aug 2013
or
isOk = all( sign(A(:)) == sign(B(:)) ) ;

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