Dear expeRts,
I somehow can't manage to do the following:
Given two vectors x and y of lengths 3 and 2, respectively, I would like to
apply
a function to each combination of the entries of x and y and receive a 3-by-2
matrix
containing the results. Now outer() seems to be the way to go, but outer()
expands
the vectors first, which leads to errors in my function. Here is the minimal
example:
x <- c(5,6,7)
y <- c(2,4)
FUN <- function(x., y.){
j <- 1:y.
sum(choose(y., j)*choose(0.5*j, x.))
}
apply(expand.grid(x, y), 1, FUN=FUN) # that should give at least a vector of
length 6, but also fails
outer(x, y, FUN=FUN) # hmm... I thought/hoped that worked...
This should be easy but I just don't see it... :-(
Cheers,
Marius
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