func Lnfact(n uint32) float64 { return float64(C.gsl_sf_lnfact(C.uint(n))) }
/* log(n!) * Faster than ln(Gamma(n+1)) for n < 170; defers for larger n. */ func LnFact(n uint32) (r float64) { r = float64(C.gsl_sf_lnfact(C.uint(n))) return r }