[R] Extending time series

[Achim Zeileis]

On Tue, 26 Apr 2005 11:52:00 -0400 Fernando Saldanha wrote:

> I noticed that when one tries to extend a time series (ts) object by a
> single period using window() actually two observations (NAs) are
> added. See below for an example. Does anyone know the reason for this
> behavior and how to avoid it?

Yes:
  end(x) + 1
is not what you expect it to be. You can set equivalently
  end = 4
  end = c(4, 1)
to achieve what you want and you can compute one of those
representations in various ways, e.g., tsp(x)[2] + 1.
Z

 
> Thanks.
> 
> FS
> 
> > x<-ts(c(1,2,3))
> > x1<- window(x, start(x), end(x) + 1, extend = TRUE)
> > x1
> Time Series:
> Start = 1 
> End = 5 
> Frequency = 1 
> [1]  1  2  3 NA NA
> 
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