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[Octave-bug-tracker] [bug #61143] Functions sum and mean returns wrong a


From: John W. Eaton
Subject: [Octave-bug-tracker] [bug #61143] Functions sum and mean returns wrong answer for single precision input
Date: Sat, 11 Sep 2021 16:21:20 -0400 (EDT)
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Firefox/78.0

Follow-up Comment #7, bug #61143 (project octave):

Can reordering ever help this case?


sum ([flintmax, 1])


Performing the summation using double can also help, but only until it
doesn't.  I don't think there is a simple "fix" for this problem except to
understand that numerical computations using a floating point representation
are not exact.  You kind of have to know what you are doing.  I don't see a
way around that.

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