mars.tensor.special.
gammaincc
Regularized lower incomplete gamma function.
It is defined as
for \(a > 0\) and \(x \geq 0\). See [dlmf] for details.
a (array_like) – Positive parameter
x (array_like) – Nonnegative argument
Values of the lower incomplete gamma function
scalar or ndarray
提示
The function satisfies the relation gammainc(a, x) + gammaincc(a, x) = 1 where gammaincc is the regularized upper incomplete gamma function.
gammainc(a, x) + gammaincc(a, x) = 1
The implementation largely follows that of [boost].
参见
regularized upper incomplete gamma function
gammaincinv
inverse of the regularized lower incomplete gamma function with respect to x
gammainccinv
inverse of the regularized upper incomplete gamma function with respect to x
引用
NIST Digital Library of Mathematical functions https://dlmf.nist.gov/8.2#E4
Maddock et. al., “Incomplete Gamma Functions”, https://www.boost.org/doc/libs/1_61_0/libs/math/doc/html/math_toolkit/sf_gamma/igamma.html