Concatenate row-wise across specific columns of dataframe

by

Try

 data$id <- paste(data$F, data$E, data$D, data$C, sep="_")

instead. The beauty of vectorized code is that you do not need row-by-row loops, or loop-equivalent *apply functions.

Edit Even better is

 data <- within(data,  id <- paste(F, E, D, C, sep=""))

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