A general Lotka-Volterra competition model, for any number of species. For use with
ode in the
deSolve package. This function uses a vector and matrix within the list of parameters.
the time point for a realization of the integration.
the vector of populations, at each time t.
a LIST containing a vector of growth rates (r), and a matrix of interaction coefficients (a).
Returns a list of length one which is the vector of the rates of increase (required by
Hank Stevens <HStevens@muohio.edu>
Lotka, A.J. (1956) Elements of Mathematical Biology. Dover Publications, Inc.
Stevens, M.H.H. (2009) A Primer of Ecology with R. Use R! Series. Springer.
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