[R] How to draw the decision boundaries for LDA and Rpart object

Prof Brian Ripley ripley at stats.ox.ac.uk
Wed Aug 9 09:04:55 CEST 2006

On Wed, 9 Aug 2006, Am Stat wrote:

> Hello useR,
> Could you please tell me how to draw the decision boundaries in a 
> scatterplot of the original data for a LDA or Rpart object.

There are examples in MASS (the book).

> For example:
> > library(rpart)
> >fit.rpart <- rpart(as.factor(group.id)~., data=data.frame(Data) )
> How can I draw the cutting lines on the orignial Data?
> Or is there any built in functions that can read the rpart object 
> 'fit.rpart' to do that?

See partition.tree in package tree.

> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.

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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