perm(N, k, exact=False)
It's also known as "partial permutations".
Number of things.
Number of elements taken.
If exact is False, then floating point precision is used, otherwise exact long integer is computed.
The number of k-permutations of N.
Permutations of N things taken k at a time, i.e., k-permutations of N.
import numpy as np
from scipy.special import perm
k = np.array([3, 4])
n = np.array([10, 10])
perm(n, k)
perm(10, 3, exact=True)
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