func Lngamma(x float64) float64 { return float64(C.gsl_sf_lngamma(C.double(x))) }
/* Log[Gamma(x)], x not a negative integer * Uses real Lanczos method. * Returns the real part of Log[Gamma[x]] when x < 0, * i.e. Log[|Gamma[x]|]. */ func LnGamma(x float64) (r float64) { r = float64(C.gsl_sf_lngamma(C.double(x))) return }