[R] ts.intersect a multivariate and univariate ts

Prof Brian Ripley ripley at stats.ox.ac.uk
Mon Jun 6 15:54:58 CEST 2005

On Mon, 6 Jun 2005, Andy Bunn wrote:

>>> R > w <- list(rnorm(10), rnorm(10))
>>> R > x <- ts(w, start = 1980)
>> Even though you don't get an error message this statement is
>> erroneous.  ?ts discusses the valid possibilities.
> So it does, might I suggest add something like this to ts:
>    if (is.list(data))
>       stop("Data must be a numeric vector or matrix")

Actually, that is not quite the case: logical time series are allowed, 
even through not documented to be allowed.  (The S4 methods start-up code 
generates one, and so a similar check which was once there was removed.)

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)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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