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christiangenco/pi_monte.rb

Created November 1, 2016 06:24
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pi_monte.rb
def pi_monte(n=100_000)
inside = total = 0
n.times{
x, y = rand*2-1, rand*2-1
d = Math.sqrt(x**2+y**2)
if d < 1
inside += 1
end
total += 1
}
(1.0*inside/total)*4
end
pi = pi_monte
p pi
p ((pi - Math::PI) / Math::PI) * 100
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