On 15/04/16 11:10, Ben Bacarisse wrote:
Oscar Benjamin <oscar.j.benja...@gmail.com> writes:
On 15 April 2016 at 10:24, Robin Becker <ro...@reportlab.com> wrote:
<snip>
yes indeed summation is hard :(
Not with Fraction it isn't:
from fractions import Fraction
def exact_sum(nums):
return sum(map(Fraction, nums))
This will give you the exact result with precisely zero rounding
error. You can convert it to float at the end.
Just a word of warning for people new to numerical work: there's no
rounding error, but unless you start with Fraction objects you still
have input or conversion errors. The uninitiated might expect
exact_sum([0.3, 0.7])
to be 1.
So I'm uninitiated:
NameError: name 'exact_sum' is not defined
I appreciate the word of warning, but, in my case, it's not helpful.
--
Tony van der Hoff | mailto:t...@vanderhoff.org
Buckinghamshire, England |
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