perm(N, k, exact=False)
It's also known as "partial permutations".
Array arguments accepted only for exact=False case.
If k > N, N < 0, or k < 0, then a 0 is returned.
Number of things.
Number of elements taken.
If :None:None:`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.
>>> from scipy.special import perm
... k = np.array([3, 4])
... n = np.array([10, 10])
... perm(n, k) array([ 720., 5040.])
>>> perm(10, 3, exact=True) 720See :
The following pages refer to to this document either explicitly or contain code examples using this.
scipy.special._basic.perm
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