func CdfGammaP(x float64, a float64, b float64) float64 { return float64(C.gsl_cdf_gamma_P(C.double(x), C.double(a), C.double(b))) }
// GammaP returns the cumulative distribution function P(x) for // the lower tail of a gamma distribution. func GammaP(x, a, b float64) float64 { return float64(C.gsl_cdf_gamma_P(C.double(x), C.double(a), C.double(b))) }