GNU Scientific Library – Reference Manual: Beta Functions

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#### 7.19.5 Beta Functions

Function: double gsl_sf_beta (double a, double b)
Function: int gsl_sf_beta_e (double a, double b, gsl_sf_result * result)

  These routines compute the Beta Function, B(a,b) = \Gamma(a)\Gamma(b)/\Gamma(a+b) subject to a and b not being negative integers.

Function: double gsl_sf_lnbeta (double a, double b)
Function: int gsl_sf_lnbeta_e (double a, double b, gsl_sf_result * result)

  These routines compute the logarithm of the Beta Function, \log(B(a,b)) subject to a and b not being negative integers.