class MoreMath::Histogram

def prepare_display(width)

histogram bar.
edge. +width+ is usually an integer number representing the width of a
the +width+-normalized frequence count value, and +r+ the right bin
Returns an array of tuples (l, c, r) where +l+ is the left bin edge, +c+ 
def prepare_display(width)
  factor = width.to_f / max_count
  @result.reverse_each.map { |bin| [ bin.left, (bin.count * factor).round, bin.right ] }
end