The spurious condition (ds==2) is actually interpreted as the action taken by the else statement.
Then the braced plot statement is seen as the next statement after the conclusion of the if () {} else () statement. [[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.