Hello, I'm trying to replace cells with value 1 with the number of the column. Example below. Thank you! from: 0,1,0,1 0,0,0,1 1,0,0,1 to: 0,2,0,4 0,0,0,4 1,0,0,4 -- View this message in context: http://n4.nabble.com/replace-cells-with-column-number-tp1838289p1838289.html Sent from the R help mailing list archive at Nabble.com.