Log_gamma

Definition:

\(log\_gamma = log\_gamma(x)\) evaluates \(\ln \Gamma (x)\).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.

\(log gamma\) (output, double)

The value of \(\ln\Gamma (x)\), x > 0