NMULTICHOOSEK

Fast unordered samples with or without repetition.

NMULTICHOOSEK(N,K) finds the number of multisets of length k on n symbols. NMULTICHOOSEK can take vector or scalar input.

NMULTICHOOSEK(N,K,'single') is the same as NCHOOSEK (unordered samples WITHOUT repetition), except that it accepts vector inputs for both n and k.

NMULTICHOOSEK(N,K,'multi') is the same as NMULTICHOOSEK(N,K).

Examples:
N = nmultichoosek(5,1:5)

finds the number of multisets of
length 1 to 5 from a 5 symbol set

N = nmultichoosek(5,1:5,'single')

is the same as:

for k=1:5
N(k) = nchoosek(5,k);
end