[Coin-discuss] Cbc returns fractional solutions

[Erling D. Andersen]

Hi

I saw the following


 UP BOUND     C0000115         1e+20
 UP BOUND     C0000116         1e+20
 UP BOUND     C0000117         1e+20
 UP BOUND     C0000118         1e+20
 UP BOUND     C0000119         1e+20
 UP BOUND     C0000120         1e+20
 UP BOUND     C0000121         1e+20
 UP BOUND     C0000122         1e+20
 UP BOUND     C0000123         1e+20
 UP BOUND     C0000124         1e+20
 UP BOUND     C0000125         1e+20
 UP BOUND     C0000126         1e+20

in your MPS file. I usually tell students I flunk them if they put numbers like 1.0e20 into their models
because they might cause alot of rounding errors.

Erling

At 17:39 10-05-2007, you wrote:
> 
> 
>Hi Everyone, 
> 
>I am getting fractional solutions for binary declared variables when I am using Cbc solver; while CPLEX is returns a message: the problem is integer infeasible.
> 
>mps is available at the following link
><http://uts.cc.utexas.edu/~jeetv/MIPproblem.mps>http://uts.cc.utexas.edu/~jeetv/MIPproblem.mps (too big to be posted here...)  and I am using minimum.cpp of Cbc example file to solve the mps file I have. 
> 
>Any help will be greatly appreciated..
> 
>regards,
>vishy
>
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>-- 
>Best Regards,
>Vishv Jeet, Ph.D.,
>Operations Research Scientist,
>Gravitant Inc.,
>(The Business Governance Company)
><http://www.gravitant.com/>http://www.gravitant.com 
>Austin, TX, USA.
>Cell    : 1-512-657-8678
>Home : 1-512-788-5795
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