Number of ordered selections of k items from n: n! / (n - k)!, defined for real n >= 0 as
Gamma(n + 1) / Gamma(n - k + 1) (0 for an integer n < k). Negative arguments give NaN.
Not an R function. It is jStat's permutation; R has only choose() (unordered selections).
Number of ordered selections of k items from n: n! / (n - k)!, defined for real n >= 0 as Gamma(n + 1) / Gamma(n - k + 1) (0 for an integer n < k). Negative arguments give NaN. Not an R function. It is jStat's
permutation; R has onlychoose()(unordered selections).