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daleobrien/round_to_signigicant_digits.py

Last active December 14, 2015 01:58
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Round a number by a number of significant digits
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round_to_signigicant_digits.py
from math import log10, floor
def round_sig(x, sig=2):
'''
>>> round_sig(0.0232)
0.023
>>> round_sig(0.0232, 1)
0.02
>>> round_sig(1234243, 3)
1230000.0
'''
return round(x, sig - int(floor(log10(x))) - 1)
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