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7.14 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.