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...wnumber 22 in b2 the b2$totalvac vector should have the value 1. So thougth of b2$totalvac <- ifelse(,1,0), but i don't what to put as the "if"-sentence. Hope you can help me -- View this message in context: http://www.nabble.com/Use-of-ifelse-for-indicating-specific-rownumber-tp22098418p22098418.html Sent from the R help mailing list archive at Nabble.com.