Hi, I have read a data frame by using read.table and set fill=TRUE, so the missing columns are filled with blank. How can I fill them with a word like NA? -- View this message in context: http://r.789695.n4.nabble.com/Fill-blank-column-in-the-data-frame-tp4386328p4386328.html Sent from the R help mailing list archive at Nabble.com.