maxframe.tensor.special.gammaincinv#

maxframe.tensor.special.gammaincinv(a, y, out=None)[source]#

Inverse to the regularized lower incomplete gamma function.

Given an input \(y\) between 0 and 1, returns \(x\) such that \(y = P(a, x)\). Here \(P\) is the regularized lower incomplete gamma function; see gammainc. This is well-defined because the lower incomplete gamma function is monotonic as can be seen from its definition in [dlmf].

Parameters:

a (array_like) – Positive parameter
y (array_like) – Parameter between 0 and 1, inclusive
out (ndarray, optional) – Optional output array for the function values

Returns:

Values of the inverse of the lower incomplete gamma function

Return type:

scalar or ndarray