On Dec 12, 2008, at 8:41 AM, Gabor Grothendieck wrote:
Its a FAQ:
http://cran.r-project.org/doc/FAQ/R-FAQ.html#How-can-I-turn-a-string-into-a-variable_003f
On Fri, Dec 12, 2008 at 8:30 AM, Philip Whittall
<philip.whitt...@detica.com> wrote:
I am still struggling to map a character string to an object name and
vice versa in R.
I thought the as.name() function might work, but observe the
following
behaviour ...
attach(warpbreaks)
levels(tension)
[1] "L" "M" "H"
levels(as.name("tension"))
NULL
objectname<-as.name("tension")
objectname
tension
levels(objectname)
NULL
So even though it sets up a symbol, this symbol isn't recognised as
an
object name by functions such as levels().
I need 2 functions, call them A and B such that A("tension") yields
the
object name tension which is recognised by functions and
B(tension) yields the character result "tension".
I see that your first request was satisfied. Your second one, that for
a method to get as a character object the name of an object did not
seem to get addressed. If tension is an R object (or a function call),
try:
---a vector
> tension <- vector()
> as.character(bquote(tension))
[1] "tension"
--- a function with no arguments
> as.character(bquote(ls()))
[1] "ls"
--- a function ( in this case the Extract or indexing function) with
arguments
> as.character(bquote(fit$terms))
[1] "$" "fit" "terms"
--
David Winsemius
Any suggestions would be greatly appreciated,
Philip
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