https://bugs.freedesktop.org/show_bug.cgi?id=80680
Priority: medium
Bug ID: 80680
Assignee: [email protected]
Summary: SOLVER crashing CALC under Windows
Severity: normal
Classification: Unclassified
OS: Windows (All)
Reporter: [email protected]
Hardware: x86 (IA32)
Status: UNCONFIRMED
Version: 4.2.5.2 release
Component: Spreadsheet
Product: LibreOffice
I'm reporting this bug in the Windows release of LO. I have experienced this
under releases 4.2.4.2 and 4.2.5.2.
I’m using the solver to find the minimum of a non-linear function calculated in
the spreadsheet found here:
http://claub.net/temp/Solver-crashes-CALC.xls
The optimized quantity is a sum-of-squares error, cell A134, and the value in
this cell should fall to 10 or less. I set up the solver to find a minimum by
manipulating the values in cells F13 through F17. The initial values I choose
are F13=1.0 and the other set to zero.
The solver runs for what seems like a long time (more than a minute on my
machine) and makes some progress reducing the error. Then it, and calc, crash
and close. This happens every time. In the LO Calc solver, I have tried both
the DEPS and SCO algorithms and both only make very slow progress and then
crash.
When I open the spreadsheet in Excel and use its solver (the GRG nonlinear
algorithm) to perform the minimization from the same initial conditions (and
others) it finishes in about 1-2 seconds and never crashes. This seems to
indicate that the minimization problem itself is not the cause of the crashing
behavior. Also, I reported this bug on another forum, and a user there could
not reproduce the crash under GNU/Linux running LO v4.1 and v4.2 so it might be
a LO Windows build-specific problem.
Thanks,
Charlie
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