Hi, I guess that the followig line in read.table tmp[i[i > 0L]] <- colClasses should read tmp[i[i > 0L]] <- colClasses[i > 0L] Is this a bug? Cheers Jens Oehlschlägel -- für nur 19,99 Euro/mtl.!* http://portal.gmx.net/de/go/dsl02