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...by using the function Apply the weeks i needed for fullfulling my goal? I already tried something with environment variables but that is a hard stop. I think, when I can select the columns I wanted with the corresponding rows, that it would not be a problem making a histogram etc. Yours, Frans Elsendoorn -- View this message in context: http://r.789695.n4.nabble.com/Apply-on-columns-tp4633468.html Sent from the R help mailing list archive at Nabble.com.