Dear R Helpers, I have a large number of data frames and I need to create a new column inside each data frame. Because there is a large number, I need to "loop" through this, but I don't know the syntax of assigning a new column name dynamically.
Below is a simple example of what I need to do. Assume that I have to do this for all 26 letters and you should see the form of the problem. Any help would be much appreciated. If more information is needed, please let me know. Many thanks. --John Sparks library(quantmod) A <- data.frame(population=c(100, 300, 5000, 2000, 900, 2500)) A$Rate<-ROC(A["population"]) B <- data.frame(population=c(200, 300, 4000, 3000, 2000, 500)) B$Rate<-ROC(B["population"]) letters<-c("A","B") length(letters) #for (i in letters){ # HELP! #} ______________________________________________ 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.