fd_predator_prey_test, a C++ program which calls fd_predator_prey() to apply the finite difference method to estimate solutions of a pair of ordinary differential equations that model the behavior of a pair of predator and prey populations.
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fd_predator_prey, a C++ program which applies the finite difference method (FDM) to a predator-prey system with time dependence and no spatial variation.
TRF_100 uses 100 timesteps, which are not enough.
TRF_1000 uses 1000 timesteps; the solution does not explode, and seems to show periodicity, except that it is clearly growing.
TRF_10000 uses 10000 timesteps. The cyclic nature of the solution is clear.