[R] how ot replace the diagonal of a matrix

From: roger bos <roger.bos_at_gmail.com>
Date: Tue 03 Oct 2006 - 20:59:04 GMT


Dear useRs,

Trying to replace the diagonal of a matrix is not working for me. I want a matrix with .6 on the diag and .4 elsewhere. The following code looks like it should work--when I lookk at mps and idx they look how I want them too--but it only replaces the first element, not each element on the diagonal.

mps <- matrix(rep(.4, 3*3), nrow=n, byrow=TRUE) idx <- diag(3)
mps
idx
mps[idx] <- rep(.6,3)

I also tried something along the lines of diag(mps=.6, ...) but it didn't know what mps was.

Thanks,

Roger



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