Let say I have an object (I hope my terminology is correct) a a <- 12> a[1] 12 And "a" has been assigned the number 12, or whatever And lets say I have a character "call_A" call_A <- "a">call_A[1] "a" What is the function "F" that allows this to happen:> F( call_A )[1] 12 -- View this message in context: http://r.789695.n4.nabble.com/call-object-from-character-tp4569686p4569686.html Sent from the R help mailing list archive at Nabble.com.
On Wed, Apr 18, 2012 at 7:25 PM, chuck.01 <CharlieTheBrown77 at gmail.com> wrote:> Let say I have an object (I hope my terminology is correct) a > a <- 12 >> a > [1] 12 > > And "a" has been assigned the number 12, or whatever > And lets say I have a character "call_A" > call_A <- "a" >>call_A > [1] "a" > > What is the function "F" that allows this to happen: >> F( call_A ) > [1] 12Use get:> a = 12 > get("a")[1] 12 HTH, Peter
Perhaps the following? get(call_A) See ?get for more details. HTH, Jorge.- On Wed, Apr 18, 2012 at 10:25 PM, chuck.01 <> wrote:> Let say I have an object (I hope my terminology is correct) a > a <- 12 > > a > [1] 12 > > And "a" has been assigned the number 12, or whatever > And lets say I have a character "call_A" > call_A <- "a" > >call_A > [1] "a" > > What is the function "F" that allows this to happen: > > F( call_A ) > [1] 12 > > > -- > View this message in context: > http://r.789695.n4.nabble.com/call-object-from-character-tp4569686p4569686.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. >[[alternative HTML version deleted]]
I figured as much. Thank you greatly. plangfelder wrote> > On Wed, Apr 18, 2012 at 7:25 PM, chuck.01 <CharlieTheBrown77@> > wrote: >> Let say I have an object (I hope my terminology is correct) a >> a <- 12 >>> a >> [1] 12 >> >> And "a" has been assigned the number 12, or whatever >> And lets say I have a character "call_A" >> call_A <- "a" >>>call_A >> [1] "a" >> >> What is the function "F" that allows this to happen: >>> F( call_A ) >> [1] 12 > > > Use get: > >> a = 12 >> get("a") > [1] 12 > > HTH, > > Peter > > ______________________________________________ > R-help@ mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. >-- View this message in context: http://r.789695.n4.nabble.com/call-object-from-character-tp4569686p4569801.html Sent from the R help mailing list archive at Nabble.com.
Almost always when people ask this question (it and its answer are FAQ 7.21) it is because they want to do things the wrong way (just don't know there is a better way). The better way is to put the variables that you want to access in this way into a list, then you can easily access the objects in the list by name (or position, or all of them, etc.): mylist <- list(a=12) call_A <- 'a' mylist[[call_A]] Adding more objects to the list is easier than creating new data objects in the global environment, and if you want to do something with all those objects (copy, delete, rename, etc.) then you have 1 list to work with rather than a bunch of separate objects. If you want to do the same operation on all the objects (the common follow-up question) then if they are in a list you can use lapply, sapply, or vapply and it is much simpler than looping and getting. On Wed, Apr 18, 2012 at 8:25 PM, chuck.01 <CharlieTheBrown77 at gmail.com> wrote:> Let say I have an object (I hope my terminology is correct) a > a <- 12 >> a > [1] 12 > > And "a" has been assigned the number 12, or whatever > And lets say I have a character "call_A" > call_A <- "a" >>call_A > [1] "a" > > What is the function "F" that allows this to happen: >> F( call_A ) > [1] 12 > > > -- > View this message in context: http://r.789695.n4.nabble.com/call-object-from-character-tp4569686p4569686.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > R-help at r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code.-- Gregory (Greg) L. Snow Ph.D. 538280 at gmail.com