Mark Dickinson <dicki...@gmail.com> added the comment:

[Irit]

> Is this still needed?

It's not needed for geometric_mean. It's still a reasonable feature request, 
but it would be non-trivial effort to put a good quality implementation 
together - C doesn't have this function, so we can't simply wrap it like we did 
for cbrt. But at least IEEE 754 does specify a "rootn" function, so we know 
what the behaviour should be in all the various special cases.

cbrt probably covers a good proportion of use-cases for rootn (those that 
weren't already satisfied by sqrt).

NumPy seems to have survived without needing a rootn function so far, which 
seems like an indication that it's not a really pressing need.

Let's close, and re-open or open a new issue if someone discovers another good 
use-case.

----------
resolution:  -> rejected
stage:  -> resolved
status: open -> closed

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<https://bugs.python.org/issue27353>
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