[R] creating list with 200 identical objects

[Rainer M Krug]

On Mon, Jun 1, 2009 at 12:27 PM, Chuck Cleland <ccleland at optonline.net> wrote:
> On 6/1/2009 6:08 AM, Rainer M Krug wrote:
>> Hi
>>
>> I am doing an simulation, and I a large proportion of the simulation
>> time is taken up by memory allocations.
>>
>> I am creating an object, and storing it in a list of those objects.
>>
>> essentially:
>>
>> x <- list()
>> for (t in 1:500) {
>>  x[1] <- new("track")
>> }

And another solution.
Thanks.

I have actually never looked at the vector() function - seems to be
quite useful.

Thanks and Cheers,

Rainer

>>
>> I would like to initialize in one go, to avoid the continuous
>> reallocation of memory when a new "track" is added, and fill it wit
>> the object created by new("track").
>>
>> How can I do this?
>
>  Does this help?
>
> x <- vector("list", 500)
> for(i in 1:500){x[[i]] <- runif(30)}
>
>> thanks
>>
>> Rainer
>
> --
> Chuck Cleland, Ph.D.
> NDRI, Inc. (www.ndri.org)
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-- 
Rainer M. Krug, Centre of Excellence for Invasion Biology,
Stellenbosch University, South Africa