forgot to attach the data set http://r.789695.n4.nabble.com/file/n4170695/WaterData.txt WaterData.txt -- View this message in context: http://r.789695.n4.nabble.com/help-wrapping-findInterval-into-a-function-tp4165464p4170695.html Sent from the R help mailing list archive at Nabble.com.