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def var1(a) sum = 0.0 sumsq = 0.0 a.each{|v| sum += v sumsq += v*v } ave = sum / a.size return sumsq / a.size - ave * ave end def var2(a) sum = 0.0 a.each{|v| sum += v } ave = sum / a.size sum = 0.0 a.each{|v| sum += (v-ave)*(v-ave) } return sum / a.size end def var3(a) sum = 0.0 diff = 0.0 a.each{ |v| y = v - diff t = sum + y diff = (t-sum)-y sum = t } ave = sum / a.size sum = 0.0 diff = 0.0 a.each{ |v| y = (v-ave)*(v-ave) - diff t = sum + y diff = (t-sum)-y sum = t } return sum / a.size end a = Array.new 100000.times{ a << rand } p var1(a) p var2(a) p var3(a)
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