tf.math.igammac

TensorFlow 1 version

Compute the upper regularized incomplete Gamma function Q(a, x).

tf.math.igammac(
    a, x, name=None
)

The upper regularized incomplete Gamma function is defined as:

\(Q(a, x) = Gamma(a, x) / Gamma(a) = 1 - P(a, x)\)

where

\(Gamma(a, x) = \int_{x}^{\infty} t^{a-1} exp(-t) dt\)

is the upper incomplete Gamma function.

Note, above P(a, x) (Igamma) is the lower regularized complete Gamma function.