[R] design()

Prof Brian Ripley ripley at stats.ox.ac.uk
Wed Jan 12 13:31:41 CET 2000

> Date: Wed, 12 Jan 2000 12:19:26 +0100
> From: ros mathieu <rosm at ufrima.imag.fr>
> X-Accept-Language: fr, en
> To: R-help <r-help at stat.math.ethz.ch>
> Subject: [R] design()
> hello all,
> Is there an equivalent in R to S-plus design() function, which creates
> an object of class "design"  ?
> why this funcion isn't implemented (I mean, is there a special reason) ?

Class "design" is basically a data frame with all columns as factors.
It is little use without functions to generate designs such as oa.design.
I suspect it has not been implemented because no one had a need for it:
you are of course welcome to implement it and oa.design and ... and
submit a package to CRAN.

> also, where can I find documentation about .Internal ?

Well, at one level it is the same as .External, so in the R-exts.texi
manual with 0.90.1.  At another level, .Internal can only be used to
add code to base R, and you follow the examples in src/main/names.c.
There is a planned section on .Internal in the draft R Language manual.

So the answer depends what you want to know: if you want to understand the
internal code, R-exts.texi will help. If you want to add code, we suggest
you use .External instead, and again R-exts.texi will help.

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 272860 (secr)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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