[R] Developing R classes
Frank E Harrell Jr
f.harrell at vanderbilt.edu
Wed Dec 29 04:16:42 CET 2004
Gabor Grothendieck wrote:
> Chambers book, Programming with Data, has a lot about S4.
> Note that S4 has more features but S3 is simpler and
> has higher performance so its not all one way. Also, they
> are related so if you learn the simpler S3 first it will
> make it easier to learn S4 later.
> I suggest you download and read the source code for
> package `zoo' for S3 and package `its' for S4. Both packages
> define irregular time series classes.
I agree with Gabor. S3 is much easier and faster to implement and has
flexibility advantages (e.g., adding new elements to fit objects for
> Date: Tue, 28 Dec 2004 13:46:10 -0300 (ART)
> From: Gilvan Justino <giljustino at yahoo.com.br>
> To: <r-help at stat.math.ethz.ch>
> Subject: [R] Developing R classes
> IÂ´m trying to write some R classes but I dinÂ´t find documentation enought to develop them. I read there is 2 ways to write classes, using S3 ou S4 models. And it seems that S4 is the best model, so I thing I should use this one.
> IÂ´m new user of R and IÂ´m searched on the net some information about creating new classes. I found this document:
> If someone knows some docs about creating our own classes, could please, post its url at here ?
> More one question... It seems that some documents about S can be applyed to R. How do you know if you can use this documentation using R ? IÂ´m asking this because some stufs I was looking for I found more explanation using S and not R. Am I right or IÂ´m looking in the wrong place ?
> Thanks a lot!
> R-help at stat.math.ethz.ch mailing list
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Frank E Harrell Jr Professor and Chair School of Medicine
Department of Biostatistics Vanderbilt University
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