glaporta glaportafreeweborg hi folk tried works perfectly tapplyiris1iris5mean obtain single table multiple variables tapply x atomic object code doesnt work tapplyiris14iris5mean thanx great summer holidays gianandrea view message context httpwwwnabblecommultipletapplytp18868063p18868063html sent r help mailing list archive nabblecom ______________________________________________ rhelprprojectorg mailing list httpsstatethzchmailmanlistinforhelp please read posting guide httpwwwrprojectorgpostingguidehtml provide commented minimal selfcontained reproducible code thu 07 aug 2008 040144 0700 r multiple tapply