[Cbc] CBC and Gurobi give different solutions

[Noli Sicad]

Hi John,

Here's zip file. The zip contents are:

1. GLPK/MathProg - runs and solve in GLPK/MathProg
2. CPLEX lp file, converted from GLPK/MathProg
3. FreeMps file which also converted using GLPK/MathProg.

The solution is 24.

Regards, Noli




On 7/11/14, John Forrest <john.forrest at fastercoin.com> wrote:
> I do not have ampl, but if someone can convert the .mod file to a .nl
> file, then I can look at it.  It might be an error in reading .nl files.
>
> John Forrest
>
> On 07/07/14 13:54, Tú San Pha.m wrote:
>> Dear all,
>>
>> I submitted the same model to NEOS using Gurobi and CBC. Gurobi gave
>> me the optimal solution with objective value equals to 24 (this is the
>> optimal solution, I have checked with CPLEX), while CBC gave me the
>> one with objective value equals to 4 (for the same instance: 6*6 matrix)
>>
>> Attached is the model that I used. Could you please give me any idea
>> why it goes wrong?
>>
>> Thanks a lot
>>
>> San
>>
>>
>> _______________________________________________
>> Cbc mailing list
>> Cbc at list.coin-or.org
>> http://list.coin-or.org/mailman/listinfo/cbc
>
>
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