[Coin-discuss] Cbc, Symphony, and GLPK

[Cheng,Jen-Min]

Microsoft Visual Studio 2008 has been used to generate executables for
Cbc driver4 2.3, Symphony 5.2, and GLPK 4.38.  These executables can
solve many MIPLIB 2003 problems.  Cbc driver4 2.3 did outperform other
two solvers in solving these MIPLIB 2003 problemsr as Cbc developers had
claimed.  

 

An artificial example of water supply and allocation had been created
and tested with Cbc driver4, Symphony, and GLPK.  GLPK produced a
feasible solution.  Symphony 5.2 produced a feasible solution, which
violated several constraints.  Cbc driver4 2.3 generated a feasible
solution, which violated more constraints than Symphony 5.2.

 

The mps file is attached.  Will any please find out why Cbc and Symphony
cannot produce a feasible solution.   

 

Thanks for your time and help.  

 

 

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