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...the code below. But it's slow for big files (which I have) and most likely there's a better way to do this 1) is there a function that would do the same as FUN.remove2ndCol 2) is there a way to avoid the "apply" for every row? Thanks, Tiago ################################### dfIn <- data.frame(a=c('ffff', 'hhhh', 'jjjj'), b=c('f', 'j', 'g'), c=c('f', 'h', 'g')) FUN.remove2ndCol <- function(vec){ vec.sub <- sub(vec['b'], '', vec['a']) vec.sub <- sub(vec['c'...