R help - Jun 2003 - Ploting rpart objects / namespace problems

On Mon, 2 Jun 2003, Luis Torgo wrote:
> I've written a small adaptation of the text.rpart function of the rpart
> package to better suite my tree presentation needs (I basically left the
code
> untouched, only changing some numbers relating to label positioning).
> 
> When I changed to version 1.7.0 this function stopped working printing the 
> error :
>     couldn't find function "rpartco"
> 
> As far as I understand this has to do with the new namespaces conventions
and
> the package rpart not exporting "rpartco". Is there an obvious
way of
> adapting my function so that I can call the function "rpartco"
even if it is
> not exported from the package? If not, is there any way of going arround
this
> without having to give up my self-tuned text.rpart ?
getFromNamespace("rpartco", "rpart")
> A second related question is the following: when I faced the problem
mentioned
> above the first thing I done was trying to print the fucntion
"text.rpart" to
> check whether something changed dramatically. I was unable to do that
because
> of the same exporting reasons I guess. The only way I manage to see the
code
> of "text.rpart" was through:
> > get("text.rpart",envir=environment(rpart))
> 
> Is there an easiest way of seeing the code of this type of
"hidden" functions?
See ?getS3method

These functions (and others) are mentioned in the NEWS file.

-- 
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

I've written a small adaptation of the text.rpart function of the rpart 
package to better suite my tree presentation needs (I basically left the code 
untouched, only changing some numbers relating to label positioning).

When I changed to version 1.7.0 this function stopped working printing the 
error :
    couldn't find function "rpartco"

As far as I understand this has to do with the new namespaces conventions and 
the package rpart not exporting "rpartco". Is there an obvious way of 
adapting my function so that I can call the function "rpartco" even if
it is
not exported from the package? If not, is there any way of going arround this 
without having to give up my self-tuned text.rpart ?

A second related question is the following: when I faced the problem mentioned 
above the first thing I done was trying to print the fucntion
"text.rpart" to
check whether something changed dramatically. I was unable to do that because 
of the same exporting reasons I guess. The only way I manage to see the code 
of "text.rpart" was through:
> get("text.rpart",envir=environment(rpart))
Is there an easiest way of seeing the code of this type of "hidden"
functions?

Thanks,
Luis
-- 
Luis Torgo
    FEP/LIACC, University of Porto   Phone : (+351) 22 607 88 30
    Machine Learning Group           Fax   : (+351) 22 600 36 54
    R. Campo Alegre, 823             email : ltorgo at liacc.up.pt
    4150 PORTO   -  PORTUGAL         WWW   : http://www.liacc.up.pt/~ltorgo