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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