[R] R and pointer

Henrik Bengtsson hb at maths.lth.se
Fri Aug 29 15:46:24 CEST 2003

Three references that are of interest (the two first are related to the
idea of using environments to do the job):

 [1] http://www.maths.lth.se/help/R/ImplementingReferences/
 [2] http://www.maths.lth.se/help/R/R.oo/
 [3] http://www.omegahat.org/OOP/

All of the above are written in the light object-oriented programming,
but from [1] you quite easily get what is needed for just emulating
"pointers". Be careful though as R is a functional language.

Best wishes

Henrik Bengtsson
Lund University

> -----Original Message-----
> From: r-help-bounces at stat.math.ethz.ch 
> [mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Jeff Gentry
> Sent: den 29 augusti 2003 14:34
> To: Laetitia Marisa
> Cc: r-help at stat.math.ethz.ch
> Subject: Re: [R] R and pointer
> > I want to write a function that modify directly variables passed as 
> > parameters (the equivalent in C language of *ptr/&ptr) so 
> that I don't 
> > have to return a list and to reaffect all my variables. Is 
> it possible 
> > to do so in R? Thanks a lot.
> You can use environments as they're passed by reference.
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