[Rd] how to use update if method for formula is not in namesp ace?
andy_liaw at merck.com
Tue Sep 14 21:53:42 CEST 2004
> From: Prof Brian Ripley
> On Tue, 14 Sep 2004, Liaw, Andy wrote:
> > Dear R-devel,
> > I've noticed that if the method for formula is not exported
> in NAMESPACE,
> > then update() would fail. As an example:
> > > library(e1071)
> > > data(iris)
> > > iris.svm <- svm(Species ~ ., data=iris)
> > > update(iris.svm)
> > Error in eval(expr, envir, enclos) : couldn't find function
> > The same thing happens with randomForest, because
> randomForest.formula() was
> > not exported. Is this the intended behavior of update()?
> What would be the
> > preferred work-around?
> It is. randomForest.formula should be written to report its
> call as to
> randomForest. Take a look at e.g. rlm.formula.
Got it! Works now. Many thanks!
> 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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