Message-ID: <20050426181050.182dc886.Achim.Zeileis@wu-wien.ac.at>
Date: 2005-04-26T16:10:50Z
From: Achim Zeileis
Subject: Extending time series
In-Reply-To: <10dee469050426085274495f88@mail.gmail.com>
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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