Dear R-list, Sorry for spamming the list lately, I am just learning the more advanced aspects of R!
I have some data that looks like this: Out Country1 Country 2 Country 3 ... CountryN 1 1 1 1 1 0 1 1 0 1 1 1 0 1 0 I want to create a new variable that counts the number of zeros in every row whenever Out is equal to 1, and else it is a zero, so it would look like this: new_var 0 0 2 I have tried the following: for (i in length(Out)){ if (Out == 1) {new_var <- sum(dat[i,] != 1)} else {new_var <- 0} } but this gives me an error message. Best, Thomas ______________________________________________ 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.