Calcualte the number of possible permutations for a vector of
length n taking k at a time
n_perm(n, k)
Arguments
| n |
length of vector |
| k |
number of values to take at a time |
Value
a numeric value or vector if input values are a vector of vectors
Examples
n_perm(10, 2)
#> [1] 90
n_perm(3, 4)
#> [1] 0