Hello, I want to build a function to call up a column of a data.frame by the names of the columns. I have column names that are sequentially named (col1, col2, etc.). How do I change a character expression into something that will be understood as a data.frame column. For example:
example<-data.frame(cbind(col1=1:10, col2=21:30, col3=41:50)) call.fun<-function(t){ x<-paste("col",t, sep="") ## Change this so that it is the data, not a character expression example$x} call.fun(t=2) Within the real function, I will continue do calculations on the column of data. My problem is that I am either getting a character expression or NULL from my function. Thanks for your help on what is probably a very simple question. John [[alternative HTML version deleted]] ______________________________________________ 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.