[R] Overriding contributed package functions

Prof Brian Ripley ripley at stats.ox.ac.uk
Thu Mar 5 20:16:36 CET 2009


The problem is that tsdiag is a generic (the same in both packages), 
and package TSA sets methods for it (and methods for classes in 
package stats which has already registered methods).

> stats:::tsdiag.Arima(model1)

ought to work (it does for me in your example), but please take with 
up with the maintainer of package TSA.
(I would be inclined to copy out of package TSA the parts your want 
and not load the rest.)

On Thu, 5 Mar 2009, Richard Saba wrote:

> The  "tsdiag" function in the TSA package overrides the "tsdiag" function in
> the "stats" package. There are a few annoying bugs in the TSA's version of
> the function so I would like to use the "stats" function but still have
> access to other TSA functions.  I have tried using  stats::tsdiag( ) but as
> long as the TSA package is attached the function from the "TSA" package is
> called. I believe the problem is the result of the TSA package not having a
> "namespace". The only solution I have found is to detach the TSA package,
> (detach("package:TSA")) , which results in the loss of all the TSA specific
> functions.  Does anyone have another solution?
> The following code illustrates the problem:
>
> Y1<-arima.sim(n=100,list(ar=c(.95,-0.2)))
> model1<-arima(Y1,order=c(2,0,0))
> tsdiag(model1)
> library(TSA)
> tsdiag(model1)
> stats::tsdiag(model1)
> detach("package:TSA")
> tsdiag(model1)
>
> R Saba
>
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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)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595



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