I'm using functions to return a matrix of all permutations of a
specified size from a larger list for predictor selection.
For each predictor size I use a seperate function like this:
bag2 <- function(n) {
rl <- c()
for (i1 in seq(n)) {
for (i2 in seq(n)) {
if (length(unique(c(i1,i2)))==1) {next}
rl <- cbind(rl,matrix(c(i1,i2)))
}
}
rl
}
bag3 <- function(n) {
rl <- c()
for (i1 in seq(n)) {
for (i2 in seq(n)) {
for (i3 in seq(n)) {
if (length(unique(c(i1,i2,i3)))==1) {next}
rl <- cbind(rl,matrix(c(i1,i2,i3)))
}
}
}
rl
}
But I think it should be somehow possible in R to use one general
function for all sizes. Can someone help?
I don't exactly know how this kind of permutation is called, maybe this
would help to find a solution.
Nick
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