?from math import *

def f(x):
	return x*x-2.0
	
def df(x):
	return 2.0*x
	
	
xp = z = 2
N = 100
eps = 1.0e-15

i = 0
abserr = abs(z)

while i<=N and abserr>eps*abs(z):
	z = xp - f(xp)/df(xp)
	
	abserr = abs(z-xp)
	print "%3i, %1.16f, feil: %1.16f" %(i, z, abserr)


	i = i + 1
	xp = z
	
print "%i iterasjoner: c=%1.16f feil=%e " %(i, z, abserr/abs(z))
print "Innebygd verdi=%1.16f" %(sqrt(2.0))