func CdfRayleighPinv(p float64, sigma float64) float64 { return float64(C.gsl_cdf_rayleigh_Pinv(C.double(p), C.double(sigma))) }
// RayleighPinv returns the inverse cumulative distribution function Pinv(x) for // the lower tail of a rayleigh distribution. func RayleighPinv(P, sigma float64) float64 { return float64(C.gsl_cdf_rayleigh_Pinv(C.double(P), C.double(sigma))) }