Re: [Rd] Arguments of 'transform'

From: Peter Dalgaard <p.dalgaard_at_biostat.ku.dk>
Date: Sat 11 Feb 2006 - 09:43:21 GMT

<Bill.Venables@csiro.au> writes:

> If you would like a 10 second R puzzle, you might like to think about
> this one:
>
>
> > g <- expand.grid(long = 130:140, lat = -(10:25))
> > gp <- transform(g, x = long, y = lat)
> Error in transform(g, x = long, y = lat) :
> object "long" not found
>
>
> I don't expect this hasn't come up before, but I can't find mention of
> it. I suggest that to minimise this little stumbling block for
> beginners (and others) we either
>
> change the name of the principal argument in transform from 'x'
> to, say '.x' (or even 'data' as it is in 'with' for example) OR
>
> at least put a note in the help file for 'transform' in the
> 'Detalis' section to say
>
> *** NOTE: The only tag name unavailable to be used is 'x'. ***

Yes it has come up before (surprisingly rarely though), and you're probably right although changing argument names of functions should never be taken lightly as there could be people using the current ones.

>
> Just another little seed.

...which is connected to my grievances with attach() &c the other day. Something about transform() just isn't The Right Way.

-- 
   O__  ---- Peter Dalgaard             ุster Farimagsgade 5, Entr.B
  c/ /'_ --- Dept. of Biostatistics     PO Box 2099, 1014 Cph. K
 (*) \(*) -- University of Copenhagen   Denmark          Ph:  (+45) 35327918
~~~~~~~~~~ - (p.dalgaard@biostat.ku.dk)                  FAX: (+45) 35327907

______________________________________________
R-devel@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-devel
Received on Sat Feb 11 20:58:32 2006

This archive was generated by hypermail 2.1.8 : Mon 20 Feb 2006 - 03:21:41 GMT