SpecFunc_IncompleteGamma

SpecFunc_IncompleteGamma(a, x, tail=False)

Incomplete Gamma function.

\forall x \in \Rset, \quad
\gamma(a, x) = \int_0^x t^{a-1}\exp(-t)\di{t}

Parameters:

a : float \in \Rset^*_+

x : float

tail : bool, optional

By default, tail is False.

Returns:

result : float

  • If tail is False: result = \gamma(a, x).
  • If tail is True: result = \Gamma(a) - \gamma(a, x).