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<div class="moz-cite-prefix">Greg,<br>
<br>
The problems seem to stem from the range of numbers in model e.g.
a pair of constraints -<br>
<br>
-1E+15 C190 +1 C225 <= +0<br>
<br>
and<br>
<br>
-4000000 C190 +1 C225 >= +0<br>
<br>
where C190 is binary<br>
<br>
I can see this causing problems (for both codes) - if C190 is
1.0e-9 is this integer feasible?<br>
<br>
Solving two ways I get<br>
<br>
ma.sol:Optimal - objective value 1664550445.89107466<br>
mb.sol:Optimal - objective value 1676264519.23880672<br>
<br>
while changing e15 to e7 (or e6 - which will fix C190 to an exact
zero) I get<br>
<br>
mc.sol:Optimal - objective value 1647162379.14471364<br>
<br>
If you want you can send me the glpsol solution and I can see if I
can duplicate that solution.<br>
<br>
John Forrest<br>
<br>
<br>
<br>
<br>
On 27/08/14 02:32, Greg Gruber wrote:<br>
</div>
<blockquote
cite="mid:CAOn2p3ctX_b=y8S5YVPJAdtJb9AGOEmaeq2vDPDM0Qr2BhLgJw@mail.gmail.com"
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<div dir="ltr">Hello, <br>
<br>
<div>I am attempting to use CBC v2.8.9, and it is reporting that
it has found the optimal solution, but the objective value
that it returns is about 20% higher than the result I get when
using another solver (glpsol). I did not set any options,
just used the defaults:<br>
<br>
</div>
<div> "cbc model.lp"<br>
<br>
</div>
<div>When running glpsol, the only option that I used was
enabling cuts:<br>
<br>
"glpsol --lp model.lp --cuts"<br>
<br>
</div>
<div>I have attached the .lp file with the model that I am
trying to solve. I appreciate any help.<br>
<br>
Thanks,<br>
Greg<br>
<br>
</div>
<div><br>
</div>
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<br>
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