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The Gamma function, Γ(x)
real gamma (
) pure nothrow @nogc @safe;
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
|integer > 0||(x-1)!|
|integer < 0||NAN|
Stephen L. Moshier (original C code). Conversion to D by Don Clugston
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