[R] [ifelse] how to maintain a value from original matrix without probs?

From: Diogo André Alagador <mcnda839_at_mncn.csic.es>
Date: Fri, 31 Oct 2008 15:59:18 +0100

Dear all,  

I have a matrix with positive and negative values.
>From this I would like to produce 2 matrices:
1st - retaining positives and putting NA in other positions 2nd - retaining negatives and putting NA in other positions  

and then apply rowMeans for both.  

I am trying to use the function ifelse in the exemplified form: ifelse(A>0,A,NA)
but by putting A as a 2nd parameter it changes dimensions of the original object.  

I wonder if I can do this, as it seems not to difficult.  

thanks in advance

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