Hi. I saw this example and I cannot begin to figure out how it works. Can anyone give me an idea on this?
n = 9e6 df = data.frame(values = rnorm(n), ID = rep(LETTERS[1:3], each = n/3), stringsAsFactors = FALSE) > head(df) values ID 1 -0.7355823 A 2 -0.4729925 A 3 -0.7417259 A 4 1.7633367 A 5 -0.3006790 A 6 0.6785947 A The idea is to replace all occurrences of A by 'Text for A'. He does this: translator_vector = c(A = 'Text for A', B = 'Text for B', C = 'Text for C') and subset this vector using df$ID: dum_vectorized = translator_vector[df$ID] It works but I have no idea why. Thank you. [[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.