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hlambda() double hlambda ( double  phi, double  k  ) Heuman lambda function Λ0(φ, k) Purpose This function computes the Heuman lambda function Λ0(φ, k). Λ0(φ, k) = F(φ, √(1 - k^2))/K(√(1 - k^2)) + (2/π) K(k) Z(φ, √(1 - k^2)) where F is the incomplete elliptic integral of the first kind, K is the complete elliptic integral of the first kind, and Z is the Jacobi zeta function. Returns Heuman lambda function Λ0(φ, k). Parameters [in] phi Argument φ. [in] k Argument k. (-1 <= k <= 1) Error handling If k < -1 or k > 1, domain error (EDOM) occurs. Range error (ERANGE) may occur. Reference boost/math/special_functions