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Add link to math.fsum().

This commit is contained in:
Raymond Hettinger 2009-04-26 22:01:46 +00:00
parent b525e18500
commit 5afb5c6630
1 changed files with 10 additions and 0 deletions
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Doc/tutorial/floatingpoint.rst
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@ -189,6 +189,16 @@ Since the representation is exact, it is useful for reliably porting values
across different versions of Python (platform independence) and exchanging
data with other languages that support the same format (such as Java and C99).
Another helpful tool is the :func:`math.fsum` function which helps mitigate
loss-of-precision during summation. It tracks "lost digits" as values are
added onto a running total. That can make a difference in overall accuracy
so that the errors do not accumulate to the point where they affect the
final total:
>>> sum([0.1] * 10) == 1.0
False
>>> math.fsum([0.1] * 10) == 1.0
True
.. _tut-fp-error: