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Function std.mathspecial.gamma
The Gamma function, Γ(x)
real gamma
(
real x
) 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
| x | Γ(x) |
|---|---|
| NAN | NAN |
| ±0.0 | ±∞ |
| integer > 0 | (x-1)! |
| integer < 0 | NAN |
| +∞ | +∞ |
| -∞ | NAN |
Authors
Stephen L. Moshier (original C code). Conversion to D by Don Clugston
License
Copyright © 1999-2018 by the D Language Foundation | Page generated by ddox.