Nothing
`permutations` <-
function (n, r, v = 1:n, set = TRUE, repeats.allowed = FALSE)
{
if (mode(n) != "numeric" || length(n) != 1 || n < 1 || (n%%1) !=
0)
stop("bad value of n")
if (mode(r) != "numeric" || length(r) != 1 || r < 1 || (r%%1) !=
0)
stop("bad value of r")
if (!is.atomic(v) || length(v) < n)
stop("v is either non-atomic or too short")
if ((r > n) & repeats.allowed == FALSE)
stop("r > n and repeats.allowed=FALSE")
if (set) {
v <- unique(sort(v))
if (length(v) < n)
stop("too few different elements")
}
v0 <- vector(mode(v), 0)
if (repeats.allowed)
sub <- function(n, r, v) {
if (r == 1)
matrix(v, n, 1)
else if (n == 1)
matrix(v, 1, r)
else {
inner <- Recall(n, r - 1, v)
cbind(rep(v, rep(nrow(inner), n)), matrix(t(inner),
ncol = ncol(inner), nrow = nrow(inner) * n,
byrow = TRUE))
}
}
else sub <- function(n, r, v) {
if (r == 1)
matrix(v, n, 1)
else if (n == 1)
matrix(v, 1, r)
else {
X <- NULL
for (i in 1:n) X <- rbind(X, cbind(v[i], Recall(n -
1, r - 1, v[-i])))
X
}
}
sub(n, r, v[1:n])
}
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