[R] Using variable names in data frame

Emmanuel Paradis paradis at isem.univ-montp2.fr
Fri Dec 22 10:15:48 CET 2000

At 14:49 22/12/00 +1100, M.McStephen at papyrus.mhri.edu.au wrote:
>Hi All,
>I'm trying to use the names from a data frame to display data in the 
>> data.n<-names(data) # put names into a vector called data.n
>[1] "ID"
>> paste("data$",data.n[1],sep="") # create the name of the column in 
>the dataframe
>[1] "data$ID"
>> as.symbol(paste("data$",data.n[1],sep=""))
>> eval(as.symbol(paste("data$",data.n[1],sep="")))
>Error in eval(expr, envir, enclos) : Object "data$ID" not found
>I want to be able to list the contents of data$ID by using data.n[1] 
>just as I would by typing data$ID at the > prompt.

Maybe what you want is:


Emmanuel Paradis
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