On Thu, 10 Feb 2000, Kelvin Lam wrote:
> Hello! I have two questions.
>
> First of all, I have a problem dealing with acf
> (Autocovariance function) and need help. First I
> defined a time series, x, which is a vector created by
> x <- ts(rnorm(200)). So I plugged the series directly
> into the acf function, acf(x) and an error message
> popped up as:
>
> Error in .C("acf", as.double(x), as.integer(sampleT),
> as.integer(nser), : C/Fortran function name not in
> load table
>
> I downloaded R to my PC and am thinking if it's
> anything to do with the operating system. Please help
> me out!
Look at ?bug.report to find out how to send a bug report with the
information we need, like the version of R in use.
Let me check one thing. You did do library(ts) and got no
error messages? Your example does work in a proper install of
rw0901 (if you have Windows on your PC, that is).
> The second question is about arima simulation. I have
> an AR and MA process and need to simulate 200
> observations from these two models. Don't know how to
> do.
Look at the example in ?filter in library(ts). That will
almost certainly not work if acf does not, though.
--
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 272860 (secr)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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