func Laplace(r *rng.GslRng, a float64) float64 { return float64(C.gsl_ran_laplace((*C.gsl_rng)(unsafe.Pointer(r.Ptr())), C.double(a))) }
// Laplace returns a random variate from the exponential distribution with width a. func Laplace(rng RngState, a float64) float64 { return float64(C.gsl_ran_laplace(rng.state, C.double(a))) }