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Calculate Pi Using archemedies method
from decimal import Decimal, getcontext
def pi_archimedes(n):
"""
Calculate n iterations of Archimedes PI recurrence relation
"""
polygon_edge_length_squared = Decimal(2)
polygon_sides = 2
for i in range(n):
polygon_edge_length_squared = 2 - 2 * (1 - polygon_edge_length_squared / 4).sqrt()
polygon_sides *= 2
return polygon_sides * polygon_edge_length_squared.sqrt()
def main():
"""
Try the series
"""
places = 100
old_result = None
for n in range(10*places):
# Do calculations with double precision
getcontext().prec = 2*places
result = pi_archimedes(n)
# Print the result with single precision
getcontext().prec = places
result = +result # do the rounding on result
print("%3d: %s" % (n, result))
if result == old_result:
break
old_result = result
Source: www.craig-wood.com
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