Well, the data set I am using is quite large, but RECORD is also a numeric
variable and data is a data frame.

Here is my sessionInfo():

>sessionInfo()
R version 2.11.0 (2010-04-22)
i386-apple-darwin9.8.0

locale:
[1] en_US.UTF-8/en_US.UTF-8/C/C/en_US.UTF-8/en_US.UTF-8

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base

loaded via a namespace (and not attached):
[1] tools_2.11.0

Passing the object itself as an argument in the function made it work, but
still do not understand why..

Jorge

On 7/27/10 3:04 PM, "Joshua Wiley" <jwiley.psych@gmail.com> wrote:

> Dear Jorge,
> 
> It might help if you included some sample data that replicates your
> problem, or, perhaps, the results of sessionInfo().  I cannot
> replicate it.  Here are my results:
> 
> 
>> > data <- data.frame(A = 1:10, RECORD = 1:10)
>> >
>> > f.graph.two.vbs<-function(dataname,v1){
> +   val<-paste(dataname,v1,sep="$")
> +   val<-eval(parse(text=val))
> +   val
> + }
>> >
>> > f.graph.two.vbs("data","RECORD")
>  [1]  1  2  3  4  5  6  7  8  9 10
>> >
> 
> Everything seems to work as expected.  I am using:
> 
>> > sessionInfo()
> R version 2.11.1 (2010-05-31)
> x86_64-pc-mingw32
> 
> Josh
> 
> On Tue, Jul 27, 2010 at 11:34 AM, Jorge A. Ahumada
> <j.ahumada@conservation.org> wrote:
>> > I am writing a function where the arguments are names of objects or
>> variable
>> > names in a data frame. To convert the strings to the objects I am using
>> > eval(parse(text=name)):
>> >
>> > f.graph.two.vbs<-function(dataname,v1){
>> >
>> >     val<-paste(dataname,v1,sep="$")
>> >     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/
>> >
>> > ______________________________________________
>> > 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.
>> >
> 
> 
> 
> --
> Joshua Wiley
> Ph.D. Student, Health Psychology
> University of California, Los Angeles
> http://www.joshuawiley.com/
> 

-- 
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/




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