Dear sage-devel,
Taking averages is a common operation, and a `mean` function
such that `mean(xx)` returns `sum(xx) / len(xx)` regardless of
the type of objects in the iterable `xx` is extremely convenient.
For instance, for a polygon whose vertices `uu` have coordinates
in a number field and are represented as vectors over that field,
`mean(uu)` finds the centre of that polygon. To center the polygon
at the origin, use `c = mean(uu)` and `vv = [u - c for u in uu]`.
In Sage 9.5, using `mean` displays a warning:
```
DeprecationWarning: sage.stats.basic_stats.mean is deprecated;
use numpy.mean or numpy.nanmean instead
```
This is after #29662 was merged in SageMath 9.5.beta1.
Alas, `numpy.mean` cannot find the mean of a list of vectors
over a number field.
Of course, as a workaround, I can define
def mean(xx):
r"""
Return the mean of this iterable.
"""
return sum(xx) / len(xx)
and place that in an `init.sage` file in my `~/.sage` folder.
Having that built into Sage is so much more convenient though.
Can we have it back?
Kind polygonal regards, --Samuel
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