It is probably easier to do this without eval and parse (see fortune(106)).
Something like: val <- get(dataname)[[v1]] hope this helps, -- Gregory (Greg) L. Snow Ph.D. Statistical Data Center Intermountain Healthcare [email protected] 801.408.8111 > -----Original Message----- > From: [email protected] [mailto:r-help-boun...@r- > project.org] On Behalf Of Jorge A. Ahumada > Sent: Tuesday, July 27, 2010 12:35 PM > To: [email protected] > Subject: [R] Eval() or parse() do not work inside function > > I am writing a function where the arguments are names of objects or > variable > names in a data frame. To convert the strings to the objects I am using > eval(parse(text=name)): > > f.graph.two.vbs<-function(dataname,v1){ > > val<-paste(dataname,v1,sep="$") > val<-eval(parse(text=val)) > val > } > > However running this returns an error: > > >f.graph.two.vbs("data","RECORD") > Error in data$RECORD : $ operator is invalid for atomic vectors > > Repeating the individual commands in the workspace does work though.. > Do I > need to pass the object data in the arguments for this to work? > > Thanks, > > Jorge > -- > Jorge A. Ahumada > Technical Director > Tropical Ecology Assessment and Monitoring Network (TEAM) > Science and Knowledge Division > Conservation International > 2011 Crystal Dr. Suite 500 > Arlington, VA 22202 > Phone: 703-341-2543 > Mobile: 202-716-3374 > http://www.teamnetwork.org/ > > ______________________________________________ > [email protected] 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. ______________________________________________ [email protected] 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.
