I'm trying to devide x into tertiles, but ends up with integer limits
even x holds one decimal. The analysis is extremely sensitive to the
limits and I like to keep them right. How can that be done?

quartiles <- quantcut( x[x >= 0], q=seq(0,1, by=(1/3))
> table(quartiles)
quartiles
[180,344] (344,448] (448,644]
    16467     16476     16452


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