# tf.raw_ops.Igamma

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

#### View aliases


**Compat aliases for migration**

See
[Migration guide](https://www.tensorflow.org/guide/migrate) for
more details.

[`tf.compat.v1.raw_ops.Igamma`](https://www.tensorflow.org/api_docs/python/tf/raw_ops/Igamma)

<br />

    tf.raw_ops.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.

<br />

<br />

<br />

| ## Args ||
|---|---|
| `a` | A `Tensor`. Must be one of the following types: `bfloat16`, `half`, `float32`, `float64`. |
| `x` | A `Tensor`. Must have the same type as `a`. |
| `name` | A name for the operation (optional). |

<br />

<br />

<br />

<br />

| ## Returns ||
|---|---|
| A `Tensor`. Has the same type as `a`. ||

<br />