scipy.special.gammaincc¶
-
scipy.special.
gammaincc
(a, x) = <ufunc 'gammaincc'>¶ Regularized upper incomplete gamma function.
Defined as
\[\frac{1}{\Gamma(a)} \int_x^\infty t^{a - 1}e^{-t} dt\]for \(a > 0\) and \(x \geq 0\). The function satisfies the relation
gammainc(a, x) + gammaincc(a, x) = 1
wheregammainc
is the regularized lower incomplete gamma function.See also
gammainc
regularized lower incomplete gamma function
gammaincinv
inverse to
gammainc
versusx
gammainccinv
inverse to
gammaincc
versusx
Notes
The implementation largely follows that of [1].
References
- 1(1,2)
Maddock et. al., “Incomplete Gamma Functions”, https://www.boost.org/doc/libs/1_61_0/libs/math/doc/html/math_toolkit/sf_gamma/igamma.html