Thanks to all for the swift replies. I'm willing to concede that changing the behaviour of [-integer(0)] is probably going to end in tears, so I'll stop arguing.
I've added a quick note on the traps page of the R wiki to explain things; feel free to expand upon it. http://wiki.r-project.org/rwiki/doku.php?id=tips:surprises:traps Regards, Richie. Mathematical Sciences Unit HSL Buxton SK17 9JN 01298 21(x8672) ------------------------------------------------------------------------ ATTENTION: This message contains privileged and confidential informatio...{{dropped}} ______________________________________________ R-help@stat.math.ethz.ch 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.