multichoose: Calculate multinomial coefficient

In randy3k/iterpc: Efficient Iterator for Permutations and Combinations

Description

This function calculates the multinomial coefficient

(∑ n_j)! / ∏ n_j!.

where n_j's are the number of multiplicities in the multiset.

Usage

multichoose(n, bigz = FALSE)

Arguments

n	a vector of group sizes
bigz	use gmp's Big Interger

Value

multinomial coefficient

Examples

# (3+1+1)!/ (3! 1! 1!) = 20
multichoose(c(3,1,1))

randy3k/iterpc documentation built on Jan. 9, 2020, 2:02 a.m.