[Python-ideas] Numerical instability was: Re: Introduce collections.Reiterable

[Tim Peters]

[Oscar Benjamin <oscar.j.benjamin at gmail.com>]
> ...
> If you know of a one-pass algorithm (or a way to improve the
> implementation I showed) that is as accurate as either the two_pass or
> three_pass methods I'd be very interested to see it (I'm sure Steven
> would be as well).

This looks interesting:

ftp://reports.stanford.edu/pub/cstr/reports/cs/tr/79/773/CS-TR-79-773.pdf

It give detailed error analyses of the methods already on the table
(although without use of `fsum()`), and invents some new ones.  It
gets hairy ;-)