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jzeta() double jzeta ( double  phi, double  k  ) Jacobi zeta function Z(φ, k) Purpose jzeta computes the Jacobi zeta function Z(φ, k). Jacobi zeta function is defined by using elliptic integrals as follows. Z(φ, k) = E(φ, k) - E(k) * F(φ, k) / K(k) The function is often defined as Z(φ, m) with m = k^2. Returns Jacobi zeta function Z(φ, k). Parameters [in] phi Argument φ [rad]. [in] k Argument k. (|k| <= 1) Error handling If |k| > 1, domain error (EDOM) occurs. Range error (ERANGE) may occur. Reference boost/math/special_functions