Complete elliptic integrals.
[K,E] = ELLIPKE(M) returns the value of the complete elliptic
integrals of the first and second kinds, evaluated at M. As currently
implemented, M is limited to 0 < M < 1.
The accuracy of ELLIPKE(M) is EPS .
Be sure you don't confuse the modulus K with the parameter M -
they are related in the following way: M = K^2