[Rd] window(): feature request

Prof Brian D Ripley ripley@stats.ox.ac.uk
Sat, 8 Apr 2000 09:31:48 +0100 (BST)

On Mon, 3 Apr 2000, Wolfgang Koller wrote:

> Dear R-developpers,
> currently the function window shows the following behaviour, if start or
> end is out of range:
> > x <- ts(1:14,start=c(1950,2),frequency=4)
> > y <- window(x,start=c(1950,1),end=c(1953,4))
> Warning messages: 
> 1: start value not changed in: window.default(x, ...) 
> 2: end value not changed in: window.default(x, ...) 
> Instead of this I would like it to fill with NAs the values before start(x)
> and after end(x). Could this be done by introducing an additional option in
> window()? Could you please consider this in future releases? Or is there a
> better way to do this using existing functions?

This is incompatible with S and the existing behaviour, so I have added a
new argument `extend' defaulting to FALSE. The new version is in the
R-devel distribution, so will not appear in a released version until 1.1.0.

> P.S.: Below I have added some code that accomplishes this aim in a separate
> function (which is probably an example of akward programming...).

[It does not handle matrix ts objects, for example, nor does it handle
changing the frequency.]

[code snipped.]

PS: R-bugs now has a `wishlist' section, so sending a feature request as a
bug report is a way to ensure it gets recorded.

Brian D. Ripley,                  ripley@stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272860 (secr)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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