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Function std.mathspecial.sgnGamma

The sign of Γ(x).

real sgnGamma (
  real x
) pure nothrow @nogc @safe;

Returns -1 if Γ(x) < 0, +1 if Γ(x) > 0, NAN if sign is indeterminate.

Note that this function can be used in conjunction with logGamma(x) to evaluate gamma for very large values of x.


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


Boost License 1.0.