# 3.5.1.3.52 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.

$log gamma$ (output, double)
The value of $\ln\Gamma (x)$, x > 0