func Ugaussian(r *rng.GslRng) float64 { return float64(C.gsl_ran_ugaussian((*C.gsl_rng)(unsafe.Pointer(r.Ptr())))) }
// UGaussian returns a unit Gaussian random variate with mean zero. func Ugaussian(rng RngState) float64 { return float64(C.gsl_ran_ugaussian(rng.state)) }