[R] extracting columns from a ts series

[Uwe Ligges]

On Tue, 25 Sep 2001, Antonio wrote:

> >For Dec columns use 
> > window(upwell, start=c(1984, 12), frequency=1)
> 
> This works OK
> 
> But the other formula not. Maybe is my fault, I was not clear. What I need is:
> 
> (Dec(t-1)+Jan(t)+Feb(t)+March(t))/4

Hmm. So the following line should do the trick. I replaced sum() by
mean() --- easy, isn't it?

 mean(window(upwell, start=c(1984, 12), end=c(1985,3)))

Uwe

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