Nothing
cz <- function(w, d, dz)
{
cz <- -w*d/dz
cz[which(cz == -Inf)] <- 0
cz[which(is.na(cz))] <- 0
cz <- as.matrix(cz)
cz_diag <- -rowSums(cz)
cz + diag(cz_diag)
}
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