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...st$biorep=='1'|list $biorep=='2')] works perfectly - but I need it to be automated. I'm quite new to R and used to programming in PHP, so I may just be "conceptually" confused about how to do this. Any help would be greatly appreciated. thanks in advance, Dries Knapen ******************************************** Dr. Dries Knapen University of Antwerp Department of Biology Ecophysiology, Biochemistry and Toxicology Groenenborgerlaan 171 - U711, B-2020 Antwerp Belgium tel ++32 3 265 33 49 fax ++32 3 265 34 97