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1.2.0 permalink

1.2.0

normalize

clojure.contrib.probabilities.finite-distributions

(normalize weights)

Convert a weight map (e.g. a map of counter values) to a distribution
by multiplying with a normalization factor. If the map has a key
:total, its value is assumed to be the sum over all the other values and
it is used for normalization. Otherwise, the sum is calculated
explicitly. The :total key is removed from the resulting distribution.

0 Examples top

Source clojure/contrib/probabilities/finite_distributions.clj:70 top

(defn normalize
  "Convert a weight map (e.g. a map of counter values) to a distribution
   by multiplying with a normalization factor. If the map has a key
   :total, its value is assumed to be the sum over all the other values and
   it is used for normalization. Otherwise, the sum is calculated
   explicitly. The :total key is removed from the resulting distribution."
  [weights]
  (let [total (:total weights)
	w (dissoc weights :total)
	s (/ 1 (if (nil? total) (reduce + (vals w)) total))]
    (scale-by w s)))

Vars in clojure.contrib.probabilities.finite-distributions/normalize: defn let

Used in 0 other vars

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normalize

clojure.contrib.probabilities.finite-distributions

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See Also top

Source clojure/contrib/probabilities/finite_distributions.clj:70 top

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