[R] multiple time series

[Prof Brian Ripley]

On Mon, 27 Sep 2004, Banachewicz KP wrote:

> thanks Dirk, I missed the obvious z[,i] option (shame on me ;-(
> however, when I tried to use z$foo I get a NULL, despite the fact that
> this particular column is not empty. any idea why ?

A multiple time series (as created by ts()) is a *matrix* not a data 
frame.  [You can create ts data frames via ts.union.]

So index its columns as a matrix, only.

> 
> 					rg,
> 
> 					Konrad
> 
> On Sun, 26 Sep 2004, Dirk Eddelbuettel wrote:
> > It works the usual way:>
> > > z <- ts(matrix(rnorm(300), 100, 3), start=c(1961, 1), frequency=12)
> > > colnames(z) <- c("foo","bar","boo")
> > > summary(z[,"boo"])
> >     Min.  1st Qu.   Median     Mean  3rd Qu.     Max.
> > -1.92700 -0.79140 -0.08982 -0.10660  0.54350  2.32600
> > >
> >
> > You could also use z$foo, or z[,1] -- i.e. it works just like the data frames.
> >
> > Dirk
> >
> > --
> > Those are my principles, and if you don't like them... well, I have others.
> >                                                 -- Groucho Marx
> >
> 
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-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
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