custom random funciton

randomize.rb

include Math

def custom(u)
  u < 0.5 ? 0.5-sqrt(0.25-u/2.0) : sqrt(u/2.0-0.25)+0.5
end
 
(0..200000).map {
  custom(rand())
}.group_by{|num| ((num*20).floor % 20)}.sort_by{|k,v| k}.each{|k,v| 
  puts "#{"%2d" % k} #{"*"*(v.size/500)}   #{v.size}"
}