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forestal
2011 Mar 14
2
code for "permutative" operation
...If the operation is sum() I can run
x <- 5:8
m <- matrix(rep(x, length(x)), ncol=length(x))
(x.r <- rowsum(m * upper.tri(m, diag=TRUE), rep(1, length(x))))
But there's two things I don't know and kindly request help or
comments upon:
(1) What is the fastest code to perfom the forestanding operation?
(2) Is there a more general function for tasks like this, not only
with the sum procedure applied to the vector? Specifically, the
zeros in the matrix may cause problems with other operations than
sum.
Thanks, *S*
--
Sascha Vieweg, saschaview at gmail.com