26 Numerics library [numerics]
26.9 Mathematical functions for floating-point types [c.math]
26.9.5 Mathematical special functions [sf.cmath]
26.9.5.3 Beta function [sf.cmath.beta]
double beta(double x, double y);
float betaf(float x, float y);
long double betal(long double x, long double y);
Effects: These functions compute the beta function of their respective arguments x and y.
Returns:
![\[%
\mathsf{B}(x, y) =
\frac{ \Gamma(x) \, \Gamma(y) }
{ \Gamma(x+y) },
\quad \mbox{for $x > 0$,\, $y > 0$}
\]](math/7422406964118445021.png)
where
x is x and
y is y.