[Libreoffice-bugs] [Bug 142933] New: Use Kahan summation algorithm for "+" and "+" operators
bugzilla-daemon at bugs.documentfoundation.org
bugzilla-daemon at bugs.documentfoundation.org
Fri Jun 18 14:44:39 UTC 2021
https://bugs.documentfoundation.org/show_bug.cgi?id=142933
Bug ID: 142933
Summary: Use Kahan summation algorithm for "+" and "+"
operators
Product: LibreOffice
Version: unspecified
Hardware: All
OS: All
Status: UNCONFIRMED
Severity: enhancement
Priority: medium
Component: Calc
Assignee: libreoffice-bugs at lists.freedesktop.org
Reporter: mikekaganski at hotmail.com
CC: dante19031999 at gmail.com, erack at redhat.com
Chained summation operations like "=1.5+2^52-2^52" could benefit from Kahan
algorithm implemented in tdf#137679. To do that, possibly we should change
tokenizer (?), so that it treats several summation operations on the same level
as one operation analogous to SUM.
It should definitely not chain summations grouped by parentheses (I guess, it
would be automatic, since operations inside parentheses are not "on the same
level"). So e.g. "=(1.5+2^52)-2^52" would still return 2.
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