// SphBessel returns the spherical bessel function jl(x)
func SphBessel(l int, x float64) float64 {
var y C.double
switch l {
case 0:
y = C.gsl_sf_bessel_j0(C.double(x))
case 1:
y = C.gsl_sf_bessel_j1(C.double(x))
case 2:
y = C.gsl_sf_bessel_j2(C.double(x))
default:
y = C.gsl_sf_bessel_jl(C.int(l), C.double(x))
}
return float64(y)
}
func J2(x float64) float64 {
return float64(C.gsl_sf_bessel_j2(C.double(x)))
}