Hi Dimtris and esteemed useRs, I don't understand why i get this error message when attempting to use merge() - > temp <- merge(x, y[,17, drop=FALSE], by=rownames, sort=FALSE) Error in as.vector(x, mode) : cannot coerce type 'closure' to vector of type 'any' It should work because: > all(rownames(x[order(rownames(x)),]) == + rownames(y[order(rownames(y[,17, drop=FALSE])),17, drop=FALSE]) .... [TRUNCATED] [1] TRUE also: > class(x); class(y[,17, drop=FALSE]) [1] "matrix" [1] "matrix" Any idea why i cant use merge() in the normal way here? I'm forced to add the column using: temp.b <- cbind(x, y[match(rownames(x), rownames(y)),17]) All insights appreciated for this leaRner, cheers, Karl
Karl Brand <k.brand at erasmusmc.nl> Department of Genetics Erasmus MC Dr Molewaterplein 50 3015 GE Rotterdam P +31 (0)10 704 3211 | F +31 (0)10 704 4743 | M +31 (0)642 777 268