logGamma
fn
real logGamma(real x)Natural logarithm of gamma function.
Returns the base e (2.718...) logarithm of the absolute value of the gamma function of the argument.
For reals, logGamma is equivalent to log(fabs(gamma(x))).
| x, logGamma(x) | NaN, NaN | integer <= 0, +∞ | ±∞, +∞ |
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