nc_multiset: Calculate the number of r-combinations of a multiset

In iterpc: Efficient Iterator for Permutations and Combinations

Description

Calculate the number of r-combinations of a multiset

Usage

nc_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 combinations (Big Integer from gmp)

Examples

x <- c("a","a","b")
# possible combinations of size 2 are "aa" and "ab".
nc_multiset(table(x), 2) # <- 2

Example output

[1] 2

iterpc documentation built on March 26, 2020, 7:29 p.m.