gammainc¶

paddle. gammainc ( x, y, name=None ) [source]

Computes the regularized lower incomplete gamma function.

\[P(x, y) = \frac{1}{\Gamma(x)} \int_{0}^{y} t^{x-1} e^{-t} dt\]

Parameters

• x (Tensor) – The non-negative argument Tensor. Must be one of the following types: float32, float64.

• y (Tensor) – The positive parameter Tensor. Must be one of the following types: float32, float64.

• name (str, optional) – Name for the operation (optional, default is None). For more information, please refer to Name.

Returns

Tensor, the gammainc of the input Tensor.

Examples

>>> import paddle

>>> x = paddle.to_tensor([0.5, 0.5, 0.5, 0.5, 0.5], dtype="float32")
>>> y = paddle.to_tensor([0, 1, 10, 100, 1000], dtype="float32")
>>> out = paddle.gammainc(x, y)
>>> print(out)
Tensor(shape=[5], dtype=float32, place=Place(cpu), stop_gradient=True,
    [0.        , 0.84270084, 0.99999225, 1.        , 1.        ])