Public bug reported:
Binary package hint: openoffice.org-calc
Ubuntu 8.10
openoffice.org-calc 1:2.4.1-11ubuntu2.1
x86-64 version
The optization solver ("Solver" from the Tools menu) seems to be
severely broken.
The attached spreadsheet demonstrates this: I try to find the x that
maximizes the expression -x with the constraint -x<=0, then the obvious
solution is x = 0, but the solver fails finding a solution.
To reproduce:
1. Open the attached spreadsheet with OpenOffice Calc.
2. Open 'Solver' from the Tools menu.
3. Press 'Load' to load the problem definition I used.
4. Press 'Options' and unselect 'Assume linear system'
5. Press 'Solve'
I'd assume it to find the solution x = $A$1 = 0, but instead the
operation times out; on termination it is revealed that $A$1 ends up in
a negative value, which violates the constraint -x<=0. Pressing Solve
again results in an even smaller value, which violates the constraint
'even more'; this indicates that the solver searches in the wrong
direction.
I suppose this is an upstream bug, but I don't know whether it should be
reported to OpenOffice.org or to go-oo.
ProblemType: Bug
Architecture: amd64
DistroRelease: Ubuntu 8.10
Package: openoffice.org-calc 1:2.4.1-11ubuntu2.1
ProcEnviron:
PATH=/home/username/bin:/home/username/local/bin:/home/username/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/mozart/bin
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: openoffice.org
Uname: Linux 2.6.24-21-generic x86_64
** Affects: openoffice.org (Ubuntu)
Importance: Undecided
Status: New
** Tags: apport-bug
--
Optimization solver in non-linear mode fails on simple linear models
https://bugs.launchpad.net/bugs/305956
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