[R] Differential Equations there use in R (population modeling)

[stephen sefick]

population# = (initialvalue @ t) - (death rate) + (fecundtity per individual) dt
to be able to vary the values of the inputs death rate and fecundity
with time using initial value @ t from the previous time step to
evaluate the function at the present time step.

On Mon, Aug 11, 2008 at 9:43 AM, Ben Bolker <bolker at ufl.edu> wrote:
> stephen sefick <ssefick <at> gmail.com> writes:
>
>>
>> e1 <- function(x,b,t){
>>       d<-(x)*(b^t)
>>       plot(d)
>> }
>>
>> e1(2, 2,seq(from=0, to=6, by=1))
>>
>> Is there a way to do this with a change in time.  I would like to use
>> differential equations.
>
>  I'm not sure what you mean by "do this with a change in time",
> but in general for ODEs you should check out lsoda in the odesolve package.
> You can also look at the ecology/environment task view.
>
>  Ben Bolker
>
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