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Dear Kai,<br>
<br>
can you check if the solution value of the restricted master problem
(RMP) is equal for SCIP and CPLEX or is there already something
strange? In general the dual multipliers you obtain after solving
the RMP are not unique so it is okay if SCIP reports other values
than CPLEX does. If you solve the pricing problem with the dual
multipliers obtained by SCIP then you should find at least some
improving column since there is obviously one left. When this is not
the case then I think there is a problem with or how you solve your
pricing problems.<br>
<br>
Best,<br>
<br>
Benny<br>
<br>
<div class="moz-cite-prefix">On 11/09/2015 10:04 AM,
<a class="moz-txt-link-abbreviated" href="mailto:weikaimas@163.com">weikaimas@163.com</a> wrote:<br>
</div>
<blockquote cite="mid:2015110917041476331717@163.com" type="cite">
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<div><span></span>Hi,</div>
<div><br>
</div>
<div><span style="font-size: 10.5pt; line-height: 1.5;
background-color: window;">I have a branch and price
algorithm.</span><span style="font-size: 10.5pt; line-height:
1.5; background-color: window;"> </span>In some round, the
dual value returned be SCIP is different from another LP solver
(CPLEX).</div>
<div>(<span style="font-size: 10.5pt; line-height: 1.5;
background-color: window;">At the begining of a round, </span><span
style="font-size: 10.5pt; line-height: 1.5; background-color:
window;">I printed the model and solve it by CPLEX to obtain
the dual value.) </span></div>
<div><br>
</div>
<div>Using the dual value provided by CPLEX, I can find some eatra
variables, which reduced the lower bound. These varibales
cannot </div>
<div>find by dual variables provided by SCIP. So, in my code, I
cannot get the real low bound by SCIP.</div>
<div> </div>
<div>My computer is 64-bit and the SCIP I used is 32-bit. Is this
the reason about my problem ?</div>
<div><br>
</div>
<div>best regard,</div>
<div><br>
</div>
<div>Kai Wei.</div>
<div><br>
</div>
<div><br>
</div>
<br>
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<br>
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</pre>
</blockquote>
<br>
<pre class="moz-signature" cols="72">--
______________________________
Benjamin Müller
Zuse Institute Berlin
Takustr. 7, 14195 Berlin
<a class="moz-txt-link-abbreviated" href="mailto:benjamin.mueller@zib.de">benjamin.mueller@zib.de</a>
+49 30 841 85-195</pre>
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