Hi Thomas,
I've been out of office for a time, but maybe you are still waiting ...
As far as I see your model is a correctly implemented ODE (!!!) system
and I don't understand what you mean with "unexpected results".
Would it be possible that your original intention was not a *continuous*
ODE but a discrete system instead?
In this case, just use the "euler" method:
## continuous system (ordinary differential equation, ODE)
output = ode(y = state, times = times, func = logGrowth, parms = parameters)
plot(output)
## discrete system (difference equation)
output = ode(y = state, times = times, func = logGrowth, parms =
parameters, method="euler")
plot(output)
Note also that you can write your problem more elegantly using vector
and matrix notation.
Thomas Petzoldt
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