[Rd] Arguments of 'transform'
p.dalgaard at biostat.ku.dk
Sat Feb 11 10:43:21 CET 2006
<Bill.Venables at 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
> 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 Øster Farimagsgade 5, Entr.B
c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K
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~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk) FAX: (+45) 35327907
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