Thank you Rob, I just downloaded it and it looks very useful. In the meantime I think I solved my immediate problem (and while pluggin' away also deepened my understanding - or so I will at least claim :-)
Esmail > I don't know if you will find this helpful, but one of the better online > chapters on R Data Objects that I've found is by Tomas Aragon > and Wayne Enanoria. Among other nice attributes it has some tables that > summarize improtant functions for working with different data objects. > The URL is: > http://www.medepi.net/epir/epir_chap02.pdf > > > Rob Baer _________________________________________________________________ Pack up or back upuse SkyDrive to transfer files or keep extra copies. Learn how. sh_skydrive_packup_042008 [[alternative HTML version deleted]]
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