func CdfGaussianPinv(p float64, sigma float64) float64 { return float64(C.gsl_cdf_gaussian_Pinv(C.double(p), C.double(sigma))) }
// GaussianPinv returns the inverse cumulative distribution function // Pinv(x) for the lower tail of a Gaussian. func GaussianPinv(P float64, sigma float64) float64 { return float64(C.gsl_cdf_gaussian_Pinv(C.double(P), C.double(sigma))) }