Hello fellow R users,
I have a matrix computation that I imagine should be relatively easy to do,
however I cannot figure out a nice way to do it. I have two matrices, for
example
mat1 <- matrix(c(1:5,rep(NA,5), 6:10), nrow=3, byrow=T)
mat2 <- matrix(c(2:6, 6:10, rep(NA,5)), nrow=3, byrow=T)
I'd like to compute the element-wise average for non-NA entries. Of course
(mat1+mat2)/2
does not work for the final two rows because of the NA's. Are there any elegant
ways to accopmlish this without writing a loop with indices?
Thanks in advance for any assistance.
Greg
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