Suppose
x <- array(c(1,1,1,1,2,2,2,2), dim = c(2,2,2))
y <- c(5, 10)
Now I would like to multiply x[, , 1] with y[1] and x[, , 2] with y[2].
Possible solution is a for-loop:
for (i in 1:2) {
x[, , i] * y[i]
}
Another possible solution is this construction:
as.vector(t(replicate(nrow(x) * ncol(x), y))) * x
I find that these two solutions have a relatively large computation time (on
larger arrays) and I suspect there should be solution with less computation
time. Is there a faster method to perform this calculation (thus to multiply
the depth of an array with respective vector elements)?
Best regards,
Maurits Aben
[[alternative HTML version deleted]]
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
