[R] How to organize/develop an R function

Spencer Graves spencer.graves at pdf.com
Fri Apr 4 18:34:55 CEST 2003

	  1.  Have you read Venables and Ripley's two books, "Modern Applied 
Statistics with S" (now in its 4th edition) and "S Programming"? 
Especially the latter book could help in this regard.

	  2.  Which version of R are you using, under which operating system? 
With R 1.6.2 under Windows 2000, I can copy a "*.r" file into a new 
directory, double click, and have R open an empty ".RData" file in that 
directory.  This is can be helpful for identifying globals that you 
thought were local to a particular function (e.g., misspelled variable 

Hope this helps.
Spencer Graves

Ernesto Jardim wrote:
> Hi
> Maybe this is not an issue about R. It's probably a programming issue
> and I am not a developer at all. Anyway my main developing activities
> are in R and that's where I have difficulties.
> When I develop a function or group of functions I lose eternities with
> the objects attributes and classes. I do a lot of object manipulation
> (lists to arrays, factors to numeric vectors, etc, etc) so that I can
> group data and apply the proper calculations/models to the proper data
> combination.
> Some times I get lost or need debugging and hell comes on earth. The
> objects names are unconsistent, the objects classes are not correct so
> methods work differently, etc.
> My question is about programming good pratices in R. Does anyone know
> about documents ? Do you use some project management software that help
> on the function structure ? Do you have any ideas ? How do you (the R
> gurus) develop your packages ?
> Thanks
> EJ
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