[R] Scoping rules in R

[ripley@stats.ox.ac.uk]

Could you tell us what you are trying to achieve here?  It looks to me as
if update() would do this sort of thing much more transparently.  Since
tst()  could be called from inside a function, you don't want to flout the
normal scope rules without a very good reason.

On Thu, 21 Mar 2002, Nicholas Lewin-Koh wrote:

> Hi,
> The following is a small test function that is part of a larger piece of
> code. If I understand things correctly both z and st.obj$call need to be
> looked for in .GlobalEnv . How do I write this so it works? And which part
> of the documentation should I be reading to get a more in depth
> explanation?
>
> Thanks
> Nicholas
>
>
> tst<- function(st.obj,z){
> G<-unique(st.obj$mem[,st.obj$depth])
> Gr<-st.obj$mem[,st.obj$depth]
>
> cphlst<-list()
>
> for(i in G){
>   assign("form",deparse(substitute(st.obj$cph.call)),env=.GlobalEnv)
>   dat<-z[Gr==i,]
>   call<-paste("coxph(",form ,",data= ",dat,")")
>   cphlst[[j]]<-eval(parse(text=call), sys.parent())
>   }
> cphlst
> }
>
>                  CH3
>                   |
>                   N             Nicholas Lewin-Koh
>                  / \            Dept of Statistics
>            N----C   C==O        Program in Ecology and Evolutionary Biology
>           ||   ||   |           Iowa State University
>           ||   ||   |           Ames, IA 50011
>           CH    C   N--CH3      http://www.public.iastate.edu/~nlewin
>             \  / \ /            nlewin at iastate.edu
>              N    C
>              |   ||             Currently
>             CH3   O             Graphics Lab
>                                 School of Computing
>                                 National University of Singapore
>      The Real Part of Coffee    kohnicho at comp.nus.edu.sg
>
>
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-- 
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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