[R] ifelse to speed up loop?

Hello, I'm not sure how to explain what I'm looking for but essentially I have a test dataset that looks like this: test: V1 1 1 2 1 3 1 4 2 5 2 6 2 7 1 8 1 9 1 10 2 11 2 12 2 And what I want to be able to do is create another column that captures a "grouping" variable t

[R] Convert a string to a variable name

Hello, I am trying to ask the user for which column their data is in, and then use this information in a function. So far I have: data <- read.csv(file.choose(), header=TRUE) col <- (winDialogString("Which column contains your data?","")) and I want to be able to reference such as: meas <- dat