mars.tensor.special.gammaincinv#
- mars.tensor.special.gammaincinv(a, b, **kwargs)[source]#
Inverse to the lower incomplete gamma function with respect to x.
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
- Returns
Values of the inverse of the lower incomplete gamma function
- Return type
scalar or ndarray
See also
gammainc
regularized lower incomplete gamma function
gammaincc
regularized upper incomplete gamma function
gammainccinv
inverse of the regualizred upper incomplete gamma function with respect to x
References
- dlmf
NIST Digital Library of Mathematical Functions https://dlmf.nist.gov/8.2#E4