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Bug #4308 ยป wrong_bignum_calc.rb

shouichi (Shouichi Kamiya), 01/24/2011 06:59 AM

 
#!/usr/bin/env ruby

class Array
def sum
reduce(0) { |s, i| s += i }
end

def avg
empty? ? 0.0 : sum.to_f / size
end

def var
empty? ? 0.0 : map { |x| x ** 2 }.avg - avg ** 2
end
end

# All of these should clearly return 0.

p [1295218865, 1295218865, 1295218865, 1295218865, 1295218865].var
#=> 0.0

p [1295218865, 1295218865, 1295218865, 1295218865, 1295218865, 1295218865].var
#=> 256.0

p [1295218865, 1295218865, 1295218865, 1295218865, 1295218865, 1295218865, 1295218865].var
#=> 0.0
    (1-1/1)