What should the input to IsRoot be? A node number (or name)? Ben -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 252 bytes Desc: OpenPGP digital signature Url : http://lists.r-forge.r-project.org/pipermail/phylobase-devl/attachments/20080827/b1929f2f/attachment.pgp