gamma
fn
real gamma(real x)The Gamma function, Γ(x)
Γ(x) is a generalisation of the factorial function to real and complex numbers. Like x!, Γ(x+1) = x * Γ(x).
Mathematically, if z.re > 0 then Γ(z) = ∫0∞ tz-1e-t dt
| x, Γ(x) | NaN, NaN | ±0.0, +∞ | integer > 0, (x-1)! | integer < 0, NaN | +∞, +∞ | -∞, NaN |
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