logdPoisson

logdPoisson(_lambda, k)

Logarithm of the probability function of a Poisson distribution.

Parameters

lambda: float, :math:`lambdageq 0`

The intensity of the Poisson distribution

kint

The number of success.

Returns

logpfloat

The natural logarithm of the probability to get successes.

Notes

This method implements Loader’s algorithm, the fast and accurate method described in [loader2000], with the further improvements mentioned in [dimitriadis2016].

Examples

>>> import openturns as ot
>>> p = ot.DistFunc.logdPoisson(5.0, 2)