davidbody

(defn calculate-pi
  "Calculates Pi using the approximation 4 * (1 - 1/3 + 1/5 - 1/7 + ...)"
  [iterations]
  (let [odd-numbers (filter odd? (iterate inc 1))]
    (* 4.0
       (apply + (map / (cycle [1.0 -1.0]) (take iterations odd-numbers))))))

(println "calculated pi =" (calculate-pi 100000))
(println "Math/PI =" Math/PI)

davidbody

#!/bin/ruby
 
def combine_mp3_files(final_mp3)
  `rm #{final_mp3}`
  Dir.glob("*.mp3").sort.each do |file|
    puts "#{file}"
    `cat "#{file}" >> #{final_mp3}`
  end
end