# Incomplete_gamma

Incomplete-gamma-func

## Definition:

evaluates the incomplete gamma functions in the normalized form

with x ≥ 0 and a > 0, to a user-specified accuracy. With this normalization, P(a, x)+Q(a, x) = 1. The function returns with machine precision as relative accuracy.

For more information please review the s14bac function in the NAG document.

## Parameters:

- a (input, double)
- The argument a of the function.
- Constraint: a > 0.0.
- x (input, double)
- The argument x of the function.
- Constraint: x > 0.0.
- P (output, double)
- The value of the incomplete gamma functions in the normalized form