text_combined: gabor grothendieck ggrothendieckgmailcom three ways 1 aggregateiris5 iris5 mean 2 librarydoby summarybyspecies iris keep true 3 librarysqldf sqldfselect species avgsepal_length sepal_length avgsepal_width sepal_width avgpetal_length petal_length avgpetal_width petal_width iris group species thu aug 7 2008 701 glaporta wrote 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 ______________________________________________ rhelprprojectorg mailing list httpsstatethzchmailmanlistinforhelp please read posting guide httpwwwrprojectorgpostingguidehtml provide commented minimal selfcontained reproducible code thu 07 aug 2008 093955 0400 r multiple tapply