Calculate the number of r-permutations of a multiset

Calculate the number of r-permutations of a multiset

np_multiset(f, r, bigz = FALSE)

Arguments

f	the frequencies of the mutliset
r	the number of object drawn from the multiset
bigz	use gmp's Big Interger

Value

the number of r-permutations (Big Integer from gmp)

Examples

x = c("a","a","b")
# possible permutations of size 2 are "aa", "ab" and "ba".
np_multiset(table(x), 2) # = 3
#> [1] 3