Symplectic Integrators

Symplectic integrators for separable and nonseparable Hamiltonians.

SymInt.zip includes the following files:

GLS - S-stage Gauss-Legendre solver, symplectic method.
SEEP - Symplectic Euler solver, explicit method.
SEEQ - Symplectic Euler solver, explicit method.
SEIP - Symplectic Euler solver, implicit method.
SEIQ - Symplectic Euler solver, implicit method.
ODE4 - Nonadaptive (classical) 4th-order Runge-Kutta solver.
SYMTEST1 - Test for symplectic methods.
SYMTEST2 - Test for symplectic methods.