Hi All, I'm using the subset function to select a list of variables, some of which are contiguous in the data frame, and others of which are not. It works fine when I use the form:
subset(mydata,select=c(x1,x3:x5,x7) ) In reality, my list is far more complex. So I would like to store it in a variable to substitute in for c(x1,x3:x5,x7) but cannot get it to work. That use of the c function seems to violate R rules, so I'm not sure how it works at all. A small simulation of the problem is below. If the variable names & orders were really this simple, I could use indices like summary( mydata[ ,c(1,3:5,7) ] ) but alas, they are not. How does the c function work this way in the first place, and how can I make this substitution? Thanks, Bob mydata <- data.frame( x1=c(1,2,3,4,5), x2=c(1,2,3,4,5), x3=c(1,2,3,4,5), x4=c(1,2,3,4,5), x5=c(1,2,3,4,5), x6=c(1,2,3,4,5), x7=c(1,2,3,4,5) ) mydata # This does what I want. summary( subset(mydata,select=c(x1,x3:x5,x7) ) ) # Can I substitute myVars? attach(mydata) myVars1 <- c(x1,x3:x5,x7) # Not looking good! myVars1 # This doesn't do the right thing. summary( subset(mydata,select=myVars1 ) ) # Total desperation on this attempt: myVars2 <- "x1,x3:x5,x7" myVars2 # This doesn't work either. summary( subset(mydata,select=myVars2 ) ) ========================================================= Bob Muenchen (pronounced Min'-chen), Manager Statistical Consulting Center U of TN Office of Information Technology 200 Stokely Management Center, Knoxville, TN 37996-0520 Voice: (865) 974-5230 FAX: (865) 974-4810 Email: [EMAIL PROTECTED] Web: http://oit.utk.edu/scc, News: http://listserv.utk.edu/archives/statnews.html ______________________________________________ R-help@stat.math.ethz.ch 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.
