question

Hello everyone!
 
Is anybody can help me to solve this silly question that unfortunately I haven't found the right way to address it.
 
Supose I have a matrix X[n,n] dimension
 
I would like to calculate the product of the vectors
 
Y=X[1,n]*X[n,1]
 
Then I would like to run the following operation
 
H=if(Y>0) {H[,1]=1}
 
The problem is that the condition "if" works only for the first element of the matrix.
 
Does anybody knows how to apply the conditional "if" to a entire vector?
 
cheers
 
Guillermo
 


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