func Landau(r *rng.GslRng) float64 { return float64(C.gsl_ran_landau((*C.gsl_rng)(unsafe.Pointer(r.Ptr())))) }
// Landay returns a random variate from the Landau distribution. func Landau(rng RngState) float64 { return float64(C.gsl_ran_landau(rng.state)) }