[R] help with simulate AR(1) data

[Rolf Turner]

On 23/07/2008, at 9:50 AM, Peter Dalgaard wrote:

> Rolf Turner wrote:
>>  matrix(unlist(lapply(1:1000,function(x){arima.sim(list(ar=0.3), 
>> 100)+mean})),nrow=1000,byrow=TRUE)
> Whatever did replicate() ever do to you to deserve getting so  
> rudely ignored?
>
> replicate(1000, arima.sim(list(ar=.3),100)) + mean
>
> (OK, so t(...) then)

	Another of the many lacunae in my knowledge ... I'd either never  
learned
	about, or had forgotten, replicate().

	BTW --- to retain the time series nature of the results, you can do:

	replicate(1000, arima.sim(list(ar=.3),100) + mean, simplify=FALSE)

		cheers,

			Rolf

P. S. Just occurred to me --- ``mean'' is a Bad Name for a mean  
vector, since
there is a function called ``mean''.  No disasters imminent, but it's  
a bad
policy.

			R.

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