Thank you Erik and Patrick,

using vectorization and apply function seem to be very promising, even
though I don't know how to use apply/sapply for updating discrete time
difference equation instead of using for loop.
(e.g, Nt+1 = Nt (1+R(K-Nt/K)))

Maybe I could use vector for different parameters,
and for loop for updating the equation.

Best,

Nic

On Sun, Jul 11, 2010 at 1:02 PM, Patrick Connolly <
p_connolly@slingshot.co.nz> wrote:

> On Fri, 09-Jul-2010 at 08:25AM -0700, S.Nicholas wrote:
>
> |> deaR useRs,
> |>
> |> I am trying to assign different values to different objects in a for
> loop.
> |> The following is a toy example of the part that has been giving me a
> hard
> |> time.
> |>
> |> The first "for loop" generates four objects, b0, b1, b2, b3 with random
> |> numbers.
> |> And, the second "for loop" is equivalent to
> |> b1 = b0
> |> b2 = b1
> |> b3 = b2
> |> b4 = b3
>
> I don't quite get the idea, but would you be able to simply reverse
> the order of those last 4 (for i in 3:0)?  That way, they won't all be
> overwritten with b0.
>
> HTH
>
>
>
> |>
> |> But, when I run this code, the result is equivalent to
> |> b1 = b0
> |> b2 = b0
> |> b3 = b0
> |> b4 = b0
> |>
> |> So, the increment does not seem to be properly working for the second
> part
> |> of the "assign" function.
> |> Why would this be?
> |>
> |> for (i in 0:3)
> |>        {
> |>            r = runif(1)
> |>            assign(paste('b',i,sep=''),r)
> |>        }
> |>
> |>
> |> for (i in 1:4)
> |>        {
> |>
> |> assign(paste('b',i,sep=''),eval(parse(text=paste('b',i-1,sep=''))))
> |>        }
> |>
> |> Thank you.
> |>
> |> Nic
> |>
> |>      [[alternative HTML version deleted]]
> |>
> |> ______________________________________________
> |> R-help@r-project.org mailing list
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> |> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> |> and provide commented, minimal, self-contained, reproducible code.
>
> --
> ~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.
>    ___    Patrick Connolly
>  {~._.~}                   Great minds discuss ideas
>  _( Y )_                 Average minds discuss events
> (:_~*~_:)                  Small minds discuss people
>  (_)-(_)                              ..... Eleanor Roosevelt
>
> ~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.
>

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