[issue27761] Private _nth_root function loses accuracy

[STINNER Victor]

STINNER Victor added the comment:

"Just for fun, here's a recipe for a correctly-rounded nth root operation for positive finite floats. I'm not suggesting using this in the business logic: it's likely way too slow (especially for large n), but it may have a use in the tests."

I don't know well the statistics module, but it looks like it doesn't use directly floats, more a somehow higher level type of numbers to try to reduce rounding errors. For me, the math module is a thin wrapper on C library math functions, except of a few functions specific to Python like math.factorial. But the statistics module is at a higher level. Maybe we should draw a line between accuracy and speed. For example, explain in the statistics module that the module is designed for accuracy?

Sorry if I completly misunderstood the design of the statistics module :-)

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue27761>
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