Name:Gammainc - incomplete gamma function
Synopsis:
x a Gammainc -> result
Examples:
2.2 1.5 Gammainc -> 0.778615
Description:
Computes the incomplete Gamma function
int(t^(a-1)*exp(-t), t=0..x) / Gamma(a)
Parameters: x (double): upper limit of integration
a (double): order of Gamma function
Remarks:
This is the incomplete Gamma function P(a,x) defined as no. 6.5.1
in Abramowitz&Stegun. Requires the GSL.
References:
http://sources.redhat.com/gsl/ref
Author:
H E Plesser
FirstVersion:
2001-07-26
Source:/opt/conda/conda-bld/nest_1512418773968/work/nest-2.14.0/sli/specialfunctionsmodule.h