Created
August 24, 2017 14:56
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from __future__ import print_function, division | |
import sys | |
def contfrac_to_frac(seq): | |
''' Convert the simple continued fraction in `seq` | |
into a fraction, num / den | |
''' | |
num, den = 1, 0 | |
for u in reversed(seq): | |
num, den = den + num*u, num | |
return num, den | |
def e_cont_frac(n): | |
''' Build `n` terms of the simple continued fraction expansion of e | |
`n` must be a positive integer | |
''' | |
seq = [2 * (i+1) // 3 if i%3 == 2 else 1 for i in range(n)] | |
seq[0] += 1 | |
return seq | |
def main(): | |
# Get the the number of terms, less one | |
n = int(sys.argv[1]) if len(sys.argv) > 1 else 11 | |
if n < 0: | |
print('Argument must be >= 0') | |
exit() | |
n += 1 | |
seq = e_cont_frac(n) | |
num, den = contfrac_to_frac(seq) | |
print('Terms =', n) | |
print('Continued fraction:', seq) | |
print('Fraction: {0} / {1}'.format(num, den)) | |
print('Float {0:0.15f}'.format(num / den)) | |
if __name__ == '__main__': | |
main() |
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