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