[Coin-discuss] Compilation error

[Brady Hunsaker]

The error below in the unit test for OsiGlpk is a (recently) known
error.  This report is extra motivation for me to do something about it.

The problem is that GLPK fails to resolve after removing a constraint.
So it's not really the interface so much as a fundamental capability of
GLPK.  I need to determine whether it's better to create a workaround in
the interface or try to change GLPK upstream so that it can handle the
situation.  It's possible that a little more investigating will reveal
something else, though.

It's on my to-do list.  We don't have a bug-tracking system up for OSI
yet, do we?

Brady

Matthew Saltzman wrote:
> On Thu, 13 Apr 2006, Cezik, Tolga wrote:
> 
>> Thank you Ted!
>>
>> I thought SYMPHONY-5.0 was newer but now I realize 5.1 was the one to
>> use. Everything seems OK. However tests are usually giving errors here
>> and there. For instance (this is Osi related, i.e. the test in
>> COIN/Osi/.)
>> ----
>> Coin0008I P0033 read with 0 errors
>> spx_simplex: initial basis is invalid
>> unitTest: OsiGlpkSolverInterfaceTest.cpp:975: void
>> OsiGlpkSolverInterfaceUnitTest(const std::string&, const
>> std::string&): Assertion `eq(objValue,2520.57)' failed.
>> zsh: abort      ./unitTest -testOsiSolverInterface
>> ----
>> And if I comment that line out, then
>> ----
>> Coin0008I 25FV47 read with 0 errors
>> eq 0 1.79769e+308 1e+300
>> unitTest: OsiSolverInterfaceTest.cpp:1324: void
>> OsiSolverInterfaceMpsUnitTest(const std::vector<OsiSolverInterface*,
>> std::allocator<OsiSolverInterface*> >&, const std::string&): Assertion
>> `equivalentVectors(vecSiP[i-1],vecSiP[i], 1.e-10,
>> vecSiP[i-1]->getColUpper(),vecSiP[i ]->getColUpper(),vecSiP[i
>> ]->getNumCols() )' failed.
>> zsh: abort      ./unitTest -testOsiSolverInterface
>> ----
>> I am not too concerned of these errors, should I?
> 
> 
> Well, the unit tests *should* pass.  That's why they're unit tests 8^).
> 
> You're using GLPK as a solver?  What version?  What OS/compiler and
> versions?
> 
>>
>> --tolga
>>
>>
>>
>>
>