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...ve I see would be to recursively store lists (elem, (elem, (elem, (...)))), which I take also would work? But I'd rather go for a standard R solution if there is one! cheers, /Johan -- -- ----------------------------------------------------------- Johan Henriksson, PhD Karolinska Institutet Ecobima AB - Custom solutions for life sciences http://www.ecobima.se <http://www.ecobima.com> http://mahogny.areta.org http://www.endrov.net <http://www.endrov.net> [[alternative HTML version deleted]]