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generate

This implements the basic Lotka-Volterra equations:

with being the reproduction rate and being the
interspecies interaction. This is implemented as a single line:

density += repro_rate * density + (interaction * density) * density;

This command also increments the timestep counter `tstep`.

An optional argument specifies a number of timesteps to run the
generate step. This improves the speed by amortising the real to
integer conversion operation over a number of timesteps. The downside
is that computation may fail if the problem is ill-conditioned
(offdiagonal elements of too large with respect to the
diagonal elements).

Russell Standish
2016-09-02