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<div class="moz-cite-prefix">Ivan,<br>
<br>
How is the model being input? Various formats use different
defaults e.g. in mps format using intorg/intend a variable with no
bound defined is 0-1. If I then add a PL entry for x1 then cbc
does say unbounded. If I use UP 10**n then optimal integer
solution is<br>
<br>
x1 = (10**n)-1<br>
x2 = 4<br>
x3 = -5*(10**(n-1))+5<br>
<br>
John Forrest<br>
<br>
On 21/03/13 18:40, Ivan Meireles Costa wrote:<br>
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cite="mid:CANMm6r14DXRKTVf5H6x0QmXW3icxEBJrx3Da-+4x6AhUD_1Mtw@mail.gmail.com"
type="cite">
<div dir="ltr">Hi guys,
<div><br>
</div>
<div>I trying to solve a small mip:</div>
<div><br>
</div>
<div>Max 2 x1 + x2 - 3 x3</div>
<div><br>
</div>
<div>subject to:</div>
<div>r1: 2 x1 + x2 >= 4</div>
<div>r2: 1 x1 + 4 x2 + 2 x3 = 5</div>
<div>r3: 3 x2 + x3 <= 7</div>
<div><br>
</div>
<div>x1 -> LB = 0</div>
<div>x2 -> LB = 0</div>
<div style="">x2 -> UB = 4</div>
<div>x3 -> UB = 5</div>
<div><br>
</div>
<div>I know it no have a optimal solution, but the
method model->secondaryStatus() returns 1 (1 linear
relaxation not feasible (or worse than cutoff) ).</div>
<div style="">However the problem is unbounded, i expected 7 (7
linear relaxation unbounded).</div>
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<td class="" style="height:12.75pt" height="17">Att.</td>
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<td
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rowspan="2" valign="middle" width="150">
<b>Ivan Meireles Costa</b><br>
<b>Analista de</b><b> otimização</b><br>
<b>Telefone:</b> 31 3508-1323<br>
<b>Celular:</b> 31 9869-6987<br>
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<td
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valign="top" width="372"> A Gapso é a escolha das
empresas que buscam se diferenciar pela gestão da
complexidade.<br>
Desenvolvemos sistemas analíticos de planejamento,
que auxiliam a definir estratégias,<br>
planejar operações, reduzir riscos e lidar melhor
com as incertezas do futuro. <br>
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