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Added a calculate PI function #309

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Merged
merged 1 commit into from
Mar 16, 2018
Merged

Added a calculate PI function #309

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21 changes: 20 additions & 1 deletion primelib/primelib.py
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Original file line number Diff line number Diff line change
Expand Up @@ -38,6 +38,25 @@
goldbach(number) // Goldbach's assumption

"""
def pi(maxK=70, prec=1008, disp=1007):
"""
maxK: nuber of iterations
prec: precision of decimal places
disp: number of decimal places shown
"""
from decimal import Decimal as Dec, getcontext as gc
gc().prec = prec
K, M, L, X, S = 6, 1, 13591409, 1, 13591409
for k in range(1, maxK+1):
M = Dec((K**3 - (K<<4)) * M / k**3)
L += 545140134
X *= -262537412640768000
S += Dec(M * L) / X
K += 12
pi = 426880 * Dec(10005).sqrt() / S
pi = Dec(str(pi)[:disp])
return pi


def isPrime(number):
"""
Expand Down Expand Up @@ -602,4 +621,4 @@ def fib(n):
ans += fib1
fib1 = tmp

return ans
return ans
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After I created this pull request I noticed this. This change was accidental.