Hello My data.frame (dat) contains many variables named var.names and others named var.names_var.id
For example var.name <- c("gdp","inf","unp") var.id <- c("w","i") x <- paste(var.name, rep(var.id, each=length(var.name)), sep="_") How can I access variables in the dama.frame by names listed in x, for example to compute gdp_w - gdp_i inf_w - inf_i unp_w - unp_i or gdp - gdp_w inf - inf_w unp - unp_w without needing to code each difference separately? Thanks for your help! Serguei Kaniovski [[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.