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davidbody/pi.clj

Created August 11, 2011 17:15
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Calculate Pi in Clojure
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pi.clj
(defn calculate-pi
"Calculates Pi using the approximation 4 * (1 - 1/3 + 1/5 - 1/7 + …)"
[iterations]
(* 4.0 (reduce + (map eval (partition 2 (interleave (cycle '(+ -)) (map #(/ 1.0 %) (take iterations (filter odd? (iterate inc 1))))))))))
(println "calculated pi =" (calculate-pi 100000))
(println "Math.PI =" (. Math PI))
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