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;<h1><join>Defining Ranges</join></h1>
;<p>Ranges run from <em>min .. max</em>.<pre>
(defstruct range 
  (max (* -1 most-positive-fixnum))
  (min most-positive-fixnum)
  (ready? t))
;</pre>A <em>dist</em> is a list of numbers plus
;the sum of those numbers.<pre>
(defstruct (dist (:include range))
  all
  (key   #'first)
  (value #'rest)
  (sum 0) 
)
;</pre>A <em>gaussian</em> is a place to store
;numbers, and enough information to extract <em>mean</em>
;and <em>standard deviation</em>.<pre>
(defstruct (gaussian (:include range))
  (sumsq 0)
  (sum 0)
  (n 0)
  mean
  stdev)
;</pre>