func Taylorcoeff(n int32, x float64) float64 { return float64(C.gsl_sf_taylorcoeff(C.int(n), C.double(x))) }
/* x^n / n! * * x >= 0.0, n >= 0 */ func TaylorCoeff(n int, x float64) (r float64) { r = float64(C.gsl_sf_taylorcoeff(C.int(n), C.double(x))) return r }