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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