# Log_gamma

Log-gamma-func

## Definition:

evaluates .x > 0. It is based on Chebyshev expansions.

If x is too large there is a danger of setting overflow so the function evaluation must fail.

For more information please review the s14abc function in the NAG document.

## Parameters:

- x (input, double)
- The argument x of the function.
- Constraint: x > 0.0.
- (output, double)
- The value of , x > 0