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# tf.math.igamma

Compute the lower regularized incomplete Gamma function P(a, x).

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


The lower regularized incomplete Gamma function is defined as:

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

where

$$gamma(a, x) = \\int_{0}^{x} t^{a-1} exp(-t) dt$$

is the lower incomplete Gamma function.

Note, above Q(a, x) (Igammac) is the upper regularized complete Gamma function.

#### Args:

• a: A Tensor. Must be one of the following types: float32, float64.
• x: A Tensor. Must have the same type as a.
• name: A name for the operation (optional).

#### Returns:

A Tensor. Has the same type as a.