[Octave-bug-tracker] [bug #61143] Functions sum and mean returns wrong answer for single precision input

[Michael Leitner]

Follow-up Comment #16, bug #61143 (project octave):

The previous comment was for single x, isn't it? Because in this case
"extra"=="double" according to the documentation, which is essentially equally
fast as native summation. And in this case I am with you. But for double x,
"extra" seems to imply Kahan summation, which is noticeably slower. Also for
doubles such effects as reported can happen (only for much larger arguments of
course), and here I would propose pairwise summation as default.

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