I have 4 columns, and about 300K plus rows with 0s and 1s. I'm trying to count how many rows satisfy a certain criteria... for instance, how many rows are there that have the first column == 1 as well as the second column == 1.
I've tried using rowSums and colSums but it keeps giving me this type of error: Error in rowSums(X[1] == 1 & X[2] == 1) : 'x' must be an array of at least two dimensions Thanks in advance! ______________________________________________ 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.
