Thanks for the replies! > sapply(1:nrow(A), function(i) f(A[i,],B[i,]) ) >
Actually, this solution is even slower than the explicit for-loop :-( Andrey ______________________________________________ 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.