[Libreoffice-bugs] [Bug 141752] calc: calculate: trap in rawsubtract, wrong calculation sequence, documentation imprecise

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=141752

--- Comment #2 from b. <newbie-02 at gmx.de> ---
@Mike Kaganski: sorry for objecting: 

1. users who know enough about fp-math, know that the calculating sequence
matters, and do meaningful (small to big?) operand ordering acc. the sequence
minuhend - subtrahend1 - subtrahend2 - subtrahend3 ... will be trapped, will be
astonished that it doesn't work as expected and documented, and turn away
frustrated with the idea 'fp-math is imprecise' ... we already have too much of
these people, missing for making a good program, 

and it's unjustified, fp-math and IEEE 754 is! precise (to some degree), calc
is messing it up in some respects, this case is clearly calc bullshitting and
you defending it ... 

and it's never ever a dupe of a kahan summation enhancement request, it might
be covered with kahan, might as well have / cause problems, see comment
https://bugs.documentfoundation.org/show_bug.cgi?id=137679#c14, but in it's
source it's different ... suggest unduping ... 

else ... file one big bug 'fp-math is imprecise', mark it as 'wontfix' and any
calculation bugs as dupes and you are done ... ;-)

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