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I forgot the reshape equivalent for converting from wide to long format. Can someone help as my matrix is very big. The followin is just an example. > m <- matrix(1:20, nrow=4, dimnames=list(LETTERS[1:4], letters[1:5])) > m a b c d e A 1 5 9 13 17 B 2 6 10 14 18 C 3 7 11 15 19 D 4 8 12 16 20 > as.data.frame(cbind(rep(rownames(m), ncol(m)), rep(colnames(m), each=nrow(m)),