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3.5.1.3.56 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