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certik/gist:996210

Created May 27, 2011 21:24
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sqrt(x) using Newton method
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gistfile1.py
def sqrt(x):
eps = 1e-10
x = float(x)
r = x/2
residual = r**2 - x
while abs(residual) > eps:
r -= residual/(2*r)
residual = r**2 - x
return r
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