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Function std.mathspecial.gamma
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, ∞ t, z-1e, -t dt
x, γ(x)
,
±0.0,
integer > 0, (x-1)!
integer < 0,
+∞, +∞
-∞,
Prototype
real gamma( real x ) pure nothrow @nogc @safe;
Authors
Stephen L. Moshier (original C code). Conversion to D by Don Clugston