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rg() double rg ( double  x, double  y, double  z  ) Carlson form of elliptic integral RG(x, y, z) Purpose rg computes the Carlson form of elliptic integral RG(x, y, z). RG(x, y, z) = (1/4π) * ∫∫√(x sin^2θ cos^2φ + y sin^2θ sin^2φ + z cos^2θ) sinθ dθdφ [θ: 0, π] [φ: 0, 2π] Returns Carlson form of elliptic integral RG(x, y, z). Parameters [in] x Argument x. (x >= 0) [in] y Argument y. (y >= 0) [in] z Argument z. (z >= 0) Error handling If x < 0, y < 0 or z < 0, domain error (EDOM) occurs. Range error (ERANGE) may occur. Reference boost/math/special_functions