I have a data.frame with all character columns, I would like to convert the last two columns into numeric.> x[1:5, ]   chrN    start      end                             1  chr1 71310034 71310064     2 chr14 23354088 23354118     3 chr14 71310034 71310064 4 chr15 37759058 37759088 
5 chr22 18262638 18262668 > apply(x, 2, FUN =  mode)    chrN       start         end        "character" "character" "character" 



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