On 11/09/2010 8:00 AM, Karl Brand wrote:
Esteemed R users and developers,
How does one 'programatically' list or call objects for use in a function?
It depends on the function.
For example, i thought i could do something better than this:
save(A.cwb, B.cwb, C.cwb, D.cwb, E.cwb, F.cwb, file="afile.RData")
with something like these-
prfxs <- c("A", "B", "C", "D", "E", "F") #**
save(as.name(paste(prfxs, "cwb", sep=".")), file="afile.RData")
For save, use list=paste(prfxs, "cwb", sep=".").
or this-
do.call(save, paste(prfxs, "cwb", sep="."), file="afile.RData")
do.call wants a *list* of arguments, not a single vector of character
strings. You could construct a list of the names of the objects you
want to save, but that's a pain. Just use the list= argument (which
doesn't want a list argument :-).
Both failed.
#** And while i've got your attention- is there a 'letter equivalent' to
seq() which would have worked nicely for prfxs? ie., letter.seq(A:F)
Not that I know of, but LETTERS[1:6] will give you the sequence, and
it's easy to write a function that you'd call as letter.seq("A", "F").
Having your function work as in your example would be messy.
Duncan Murdoch
Thoughts and suggestions sincerely appreciated,
Karl
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