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Function `std.mathspecial.sgnGamma`

The sign of Γ(x).


						
				real sgnGamma(
				
  real x
				

				) pure nothrow @nogc @safe;

Parameters

Name	Description
x	the argument of Γ

Returns

-1 if Γ(x) < 0, +1 if Γ(x) > 0, and NAN if Γ(x) does not exist.

Note

This function can be used in conjunction with logGamma to evaluate Γ(x) when gamma(x) is too large to be represented as a real.

Example

writeln(sgnGamma(10_000)); // 1

Authors

Stephen L. Moshier (original C code). Conversion to D by Don Clugston

License

Boost License 1.0.