Elliptic Functions (Jacobi)
The Jacobian Elliptic functions are defined in Abramowitz & Stegun,
Chapter 16. The functions are declared in the header file
`gsl_sf_elljac.h'.
- Function: int gsl_sf_elljac_e (double u, double m, double * sn, double * cn, double * dn)
-
This function computes the Jacobian elliptic functions sn(u|m),
cn(u|m), dn(u|m) by descending Landen
transformations.