More elegant way of excluding rows with equal values in any 2 columns?
An embedded and charset-unspecified text was scrubbed... Name: not available URL: <https://stat.ethz.ch/pipermail/r-help/attachments/20090921/2c7115e2/attachment-0001.pl>
An embedded and charset-unspecified text was scrubbed... Name: not available URL: <https://stat.ethz.ch/pipermail/r-help/attachments/20090921/2c7115e2/attachment-0001.pl>