[Symphony] How to get the solutions in MSVC++ IDE

[claude philippe medard]

Hi Terry,

The "VRP" problem in the O.R. literature reads "Given a fleet of x trucks,
...", hence why most probably one has to specify the number of trucks.

If you are trying to solve some variant of the VRP problem for your
industrial application, e.g. also determine the optimal number of trucks to
be used, may i suggest you think about it and do it yourself, and then add
your solution as open source into the repository as a "variant" problem.

Thank you Ted for Symphony... (!)

best regards,
Claude Ph Medard




On Wed, Jan 21, 2009 at 11:29 AM, Yiqing Zhong <yiqing.zhong at ugent.be>wrote:

> Hi! Ted,
>
> Thank you! I understand now the number of trucks should be specified
> before the solving in the VRP project. But if so for any given data,
> that seems not very intelligent.
>
>
> Hi! Menal,
>
> Thank you very much for your help. The problem "GLPK" was fixed, gmpl
> model can be read. I added the library 'glpk' as an external file, but
> in MSVC++ Express Edition 2005, it seems cannot be set on the
> dependencies. Anyway it worked now!
>
> But  one is gone, one is coming...-_-:
>
> I am trying to use CPLEX solver in SYMPHONY, I change the preprocessor
> definition in the projects from "__OSI_CLP__" to "__OSI_CPLEX__", also
> change the path definitions of the include files: add
> "..\..\..\..\COIN\Osi\OsiCpx" and "C:\ILOG\cplex81\include\ilcplex"
> (assuming CPLEX is installed here) as the
> solver's header files path definitions, but the errors are happened
> during the BBuilding process:
>
> "7>libsymphony.lib(lp_solver.obj) : error LNK2019: unresolved external
> symbol "public: __thiscall
> OsiCpxSolverInterface::OsiCpxSolverInterface(void)"
> (??0OsiCpxSolverInterface@@QAE at XZ) referenced in function "void
> __cdecl open_lp_solver(struct LPDATA *)"
> (?open_lp_solver@@YAXPAULPDATA@@@Z)
> 7>libsymphony.lib(lp_solver.obj) : error LNK2019: unresolved external
> symbol _CPXgetslack at 20 referenced in function "void __cdecl
> get_slacks(struct LPDATA *)" (?get_slacks@@YAXPAULPDATA@@@Z)
> 7>libsymphony.lib(lp_solver.obj) : error LNK2019: unresolved external
> symbol "public: struct cpxenv * __thiscall
> OsiCpxSolverInterface::getEnvironmentPtr(void)"
> (?getEnvironmentPtr at OsiCpxSolverInterface@@QAEPAUcpxenv@@XZ)
> referenced in function "void __cdecl get_slacks(struct LPDATA *)"
> (?get_slacks@@YAXPAULPDATA@@@Z)
> 7>libsymphony.lib(lp_solver.obj) : error LNK2019: unresolved external
> symbol "public: struct cpxlp * __thiscall
> OsiCpxSolverInterface::getLpPtr(int)"
> (?getLpPtr at OsiCpxSolverInterface@@QAEPAUcpxlp@@H at Z) referenced in
> function "void __cdecl get_slacks(struct LPDATA *)"
> (?get_slacks@@YAXPAULPDATA@@@Z)
> 7>D:\Microsoft Visual Studio
> 8\SYMPHONY-5.1.10\SYMPHONY\MSVisualStudio\v8\Release\symphony.exe :
> fatal error LNK1120: 4 unresolved externals
> 7>Build log was saved at "file://d:\Microsoft Visual Studio
> 8\SYMPHONY-5.1.10\SYMPHONY\MSVisualStudio\v8\Release\BuildLog.htm"
> 7>symphony - 5 error(s), 0 warning(s)
> ========== Rebuild All: 6 succeeded, 1 failed, 0 skipped =========="
>
> I try the "__CPLEX__" again, it connot work yet. What's the possible
> problem?
>
> Thank you!
>
> Bests!
>
> Terry
>
>
> Quoting Ted Ralphs <ted at Lehigh.EDU>:
>
> > Yiqing Zhong wrote:
> >> Hi! Menal,
> >>
> >> Thank you very much for your answer. Followed with your
> >> instruction, I can execute the project now. However in the 'VRP'
> >> project, there still  some problems:
> >>
> >> I set the arguments "-F ..\..\sample.vrp" to try to check the
> >> sample  solution under the VRP folder, but the error is shown:
> >>
> >> "PROBELM NAME: ei151
> >>  TYPE: CVRP
> >>  DIMENSION: 51
> >>  ERROR: Number of trucks not specified or computed for VRP"
> >
> > For the SYMPHONY VRP solver, you need to specify the number of trucks
> > on the command line with "-N 5" for instance. You're getting the error
> > because you haven't done that. I thought that the README specified
> > this, but if it doesn't, I guess we need to add it. Thanks for using
> > SYMPHONY.
> >
> > Cheers,
> >
> > Ted
> > --
> > Dr. Ted Ralphs
> > Associate Professor, Lehigh University (permanent)
> > Visiting Lecturer, Operations Research Society of New Zealand (current)
> > (610)628-1280
> > ted 'at' lehigh 'dot' edu
> > coral.ie.lehigh.edu/~ted <http://coral.ie.lehigh.edu/%7Eted>
>
>
>
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