scipy.misc.factorialk¶
- scipy.misc.factorialk(n, k, exact=True)[source]¶
n(!!...!) = multifactorial of order k k times
Parameters: n : int
Calculate multifactorial. If n < 0, the return value is 0.
exact : bool, optional
If exact is set to True, calculate the answer exactly using integer arithmetic.
Returns: val : int
Multi factorial of n.
Raises: NotImplementedError
Raises when exact is False
Examples
>>> sc.factorialk(5, 1, exact=True) 120L >>> sc.factorialk(5, 3, exact=True) 10L