[R] Array arithmetic

From: Gang Chen <gangchen6_at_gmail.com>
Date: Thu, 06 Mar 2008 13:33:30 -0500


I have two arrays A and B with dimensions of (L, M, N, P) and (L, M, N), and I want to do

for (i in 1:L) {
for (j in 1:M) {
for (k in 1:N) {

   if (abs(B[i, j, k]) > 10e-5) C[i, j, k,] <- A[i, j, k,]/B[i, j, k]    else C[i, j, k,] <- 0
}
}
}

How can I get C more efficiently than looping?

Thanks,
Gang



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