choose() [1/2]

int stan::math::choose ( int  n, int  k  )

inline

Return the binomial coefficient for the specified integer arguments.

The binomial coefficient, \({n \choose k}\), read "n choose k", is defined for \(0 \leq k \leq n\) (otherwise return 0) by

\({n \choose k} = \frac{n!}{k! (n-k)!}\).

Parameters

n	total number of objects
k	number of objects chosen

Returns

n choose k or 0 iff k > n

Exceptions

std::domain_error

if either argument is negative or the result will not fit in an int type

Definition at line 29 of file choose.hpp.