Hello,
Try the following.
set.seed(27846)
A <- matrix(sample(0:2, 16, TRUE), ncol = 4)
B <- matrix(1:16, ncol = 4)
zeros <- which(A == 0, arr.ind = TRUE)
B[zeros] <- 0
Hope this helps,
Rui Barradas
Em 19-05-2013 22:05, eliza botto escreveu:
Dear useRs,i have two distance matrices A and B. The distances in A are linked with
distances in B. What i want to do is the following...There are some points in A where
distances are zero(those points are apart from usual diagonal of zero values).Whereas, in
B the distances at those points are not necessarily zeros . i want "0" at those
points in B where distance in A is zero. How can i do that??i hope my question is
clearthanks indeed in advance,Eliza
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