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<div style="direction: ltr;">Hi Matthias</div>
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<div style="direction: ltr;">Thanks for your help!</div>
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<div style="direction: ltr;">Currently I cannot change my model. </div>
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<div style="direction: ltr;">Besides, the reason why I enforced 1e-10 is that I got another problem before. At that time, the feasible solution was actually not constrained by my model. For example there was an equation ‘x+y=0’, but the solution showed ‘x=1e-6’
and ‘y=0’, and I was suggested to use very low tolerance and then I got like ‘x=1e-6’ ‘y=-1e-6’.</div>
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<div style="direction: ltr;">Considering this, do you think I can adjust some parameters to save time when running SoPlex instead of changing the model?
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<div style="direction: ltr;">Best regards </div>
<div style="direction: ltr;">Yu</div>
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<div>Sent from my phone. Excuse the brevity.</div>
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<div class="gmail_quote">On Fri, Aug 17, 2018 at 12:00 PM +0200, "Matthias Miltenberger"
<span dir="ltr"><<a href="mailto:miltenberger@zib.de" target="_blank">miltenberger@zib.de</a>></span> wrote:<br>
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<div dir="3D"ltr"">Dear Yu Chen,<br>
<br>
your model has some numerical issues. The matrix coefficients are in the of 1e-05 to 1e+11. Such a large range can easily cause difficulties and violations in the final result.<br>
To make matters worse, you are disabling presolving/simplification (-s0) and enforce very small tolerances (1e-10).<br>
<br>
Testing other solvers on this instances also yielded warnings and violations due to the bad numerics.<br>
<br>
My advice: Try to improve the model and verify that your result is actually meaningful with regards to the problem. I don't think that such a small tolerance is really required.<br>
<br>
Oh and by the way: On my machine the model was solved within a second using the standard tolerances and default settings.<br>
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Cheers<br>
Matthias<br>
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<div class="moz-cite-prefix">On 17.08.2018 10:59, Yu Chen wrote:<br>
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<p class="MsoNormal"><span style="font-size:11.0pt" lang="EN-US">Hi, <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt" lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt" lang="EN-US">I am new to Soplex but I encountered a trouble when using it.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt" lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt" lang="EN-US">I made a LP file and used the code in terminal:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt" lang="EN-US"><o:p> </o:p></span></p>
<p class="p1"><span lang="EN-US">/build/bin/soplex -f1e-10 -o1e-10 -l1e-10 -s0 -x -q -c<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt" lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt" lang="EN-US">But the Soplex took nearly one day to solve it. Do you know how to decrease the solving time?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt" lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt" lang="EN-US">Best regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt" lang="EN-US">Yu<o:p></o:p></span></p>
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<pre wrap="">_______________________________________________
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<pre class="moz-signature" cols="72">--
\__________________
Matthias Miltenberger
Zuse Institute Berlin
Takustr. 7, 14195 Berlin
<a class="moz-txt-link-abbreviated" href="http://www.zib.de/miltenberger">www.zib.de/miltenberger</a>
<a class="moz-txt-link-abbreviated" href="mailto:miltenberger@zib.de">miltenberger@zib.de</a>
+49 (30) 841 85-245</pre>
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