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array
2012 Mar 11
2
Efficient access to elements of a list of lists
Hi,
I have a long list of lists from which I want to efficiently extract
and rbind elements. So I'm using the approach below:
f <- function(i){
out <- replicate(5, list(matrix(rnorm(80), nc=20)))
names(out) <- letters[1:5]
out
}
set.seed(1)
lst <- lapply(1:1.5e6, f)
(t0 <- system.time(tmp <- do.call(rbind, lapply(lst, '[[', 'b'))))
Is there