func Poch(a float64, x float64) float64 {
return float64(C.gsl_sf_poch(C.double(a), C.double(x)))
}
/* Pochhammer (Apell) symbol
* (a)_x := Gamma[a + x]/Gamma[x]
*
* a != neg integer, a+x != neg integer
*
*/
func Poch(a, x float64) (r float64) {
r = float64(C.gsl_sf_poch(C.double(a), C.double(x)))
return
}