R-alpha: User friendly functions

[Kurt Hornik]

>>>>> Peter Dalgaard BSA writes:

> A loose idea for *post*-0.50 development
> I've been giving a some (but not all that many) thoughts to whether
> some of the conceptual difficulties facing newcomers could be avoided
> by having simplified functions for common operations. We already have
> parts of this, e.g. in Kurts ctest routines. Specifically, I was
> thinking about data frames: How about

> dfr.sel<-select.frame(dfr,age,sex,pain1:pain5)

> with the : specifying a range, instead of 

> dfr.sel<-dfr[,c(1,2,5,6,7,8,9)] 

> or 

> attach(dfr)
> dfr.sel<-data.frame(age,sex,pain1,pain2,pain3,pain4,pain5) 
> detach(dfr)

> (which isn't even safe if there are variables of the same name in the
> global environment)

> similarly, how about

> dfr.sub<-subset.frame(dfr,sex==1 && age > 30)

> rather than

> dfr.sub<-dfr[dfr$sex==1 && dfr$age > 30,]

> Both would seem to be quite possible to implement, although they do
> need to do some sneaky bits of computing-on-the-language internally.

Something like that would be very nice to have.

-k
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