ellK

Function: ellK
Section: transcendental
C-Name: ellK
Prototype: Gp
Help: ellK(k): Complete elliptic integral of the first kind for the
 complex parameter k using the agm.
Doc: Complete elliptic integral of the first kind
 $$K(k)=\int_0^{\pi/2}(1-k^2\sin(t)^2)^{-1/2}\,dt$$ for the
 complex parameter $k$ using the agm.