beta() [10/13]

var stan::math::beta ( double  a, const var &  b  )

inline

Returns the beta function and gradient for second var input.

\[ \mathrm{beta}(a,b) = \left(B\left(a,b\right)\right) \]

\[ \frac{\partial }{\partial b} = \left(\psi^{\left(0\right)}\left(b\right) - \psi^{\left(0\right)} \left(a + b\right)\right) \mathrm{beta}(a,b) \]

Parameters

a	double Argument
b	var Argument

Returns

Result of beta function

Definition at line 92 of file beta.hpp.