[R] help on R programming.

[Murad Nayal]

thanks you all for the replies, it's been very helpful.

regards

Prof Brian Ripley wrote:
> 
> On Mon, 23 Jun 2003, Murad Nayal wrote:
> 
> > - what is the correct way to -remove- a component from a list. this
> > seems to do the trick: list[[1]] = NULL, however, you'd think this
> > should simply attach a NULL object at the first component position?
> 
> This is in the FAQ, section 3.3.3, and is an S/R difference that catches
> people quite often.  It's related to the difference between [] and [[]].
> 
> Generally you will find that it is better to program by generating whole
> lists with lapply() or to copy lists retaining what you want (which does
> not copy the components, in general, and so is cheap).
> 
> As for your comments on books: `S Programming' does discuss the design of
> classes (both informal and formal), the main data sructures in R. As
> others have said, the Green Book (Chambers, 1998) is by not means out of
> date, except in the sense that the precise langage it describes has never
> been available: it is not a description of any version of S-PLUS nor R.
> 
> Generally, though, you need to make sure you have at your fingertips the
> resources which come with R: the various manuals (including R-lang) and
> the on-line help.  For example, I have just spend several days documenting
> in the help pages exactly how subscripting of data frames works (and
> correcting dozens of anomalies and bugs).
> 
> --
> 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
> 
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
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-- 
Murad Nayal M.D. Ph.D.
Department of Biochemistry and Molecular Biophysics
College of Physicians and Surgeons of Columbia University
630 West 168th Street. New York, NY 10032
Tel: 212-305-6884	Fax: 212-305-6926