<div dir="ltr">Hi, thanls Ambros and Hans for the reply.<div><br></div><div>I installed and compiled IPOPT. I am not being able to install SCIP with IPOPT, I tried to reinstall scip like you said:</div><div><br></div><div>
make IPOPT=true</div><div><br></div><div>But I don't know where do I provide the link to IPOPT libraries. I get the error:</div><div><br></div><div><div>src/nlpi/nlpi_ipopt.cpp:45:25: fatal error: IpoptConfig.h: No such file or directory</div>
<div>compilation terminated.</div><div>make[2]: *** [obj/O.linux.x86_64.gnu.opt/lib/nlpi/nlpi_ipopt.o] Error 1</div></div><div><br></div><div>Do you know how to proceed?</div><div><br></div><div>Thank you very much and sorry if this is stupid,</div>
<div>Cristiano</div><div><br></div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Mon, Sep 30, 2013 at 4:01 PM, Ambros Gleixner <span dir="ltr"><<a href="mailto:gleixner@zib.de" target="_blank">gleixner@zib.de</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi Cristiano,<br>
<br>
exactly, your installation seems to miss Ipopt. You have to use "make IPOPT=true" when compiling SCIP and provide the link to the build directory of your Ipopt installation.<br>
<br>
Best regards,<br>
<br>
Ambros<br>
<br>
<br>
<br>
Am 30.09.2013 16:55, schrieb Cristiano Arbex:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div class="h5">
Hi again,<br>
<br>
I've been using the NEOS server to test SCIP and I've been impressed<br>
with its speed. I tried solving 36 nonlinear instances and the largest<br>
one can be downloaded here:<br>
<br>
<a href="https://docs.google.com/file/d/0B4Rt5z2PACNndUZUc184dVBxQVU/edit?usp=sharing" target="_blank">https://docs.google.com/file/<u></u>d/<u></u>0B4Rt5z2PACNndUZUc184dVBxQVU/<u></u>edit?usp=sharing</a><br>
<br>
It takes NEOS SCIP 6 seconds to solve it. I am using the same scip.set<br>
parameters file that can be found on NEOS. I installed the SCIP<br>
optimization suite following the steps in the link provided in the first<br>
message of this thread.<br>
<br>
I know my PC is slower than the NEOS server but SCIP on my PC has been<br>
solving the same instance for 1200s. In the output file I get this message:<br>
<br>
--------------<br>
Presolving Time: 4.20<br>
Quadratic constraint handler does not have LAPACK for eigenvalue<br>
computation. Will assume that matrices (with size > 2x2) are indefinite.<br>
<br>
time | node | left |LP iter|LP it/n| mem |mdpt |frac |vars |cons<br>
|cols |rows |cuts |confs|strbr| dualbound | primalbound | gap<br>
6.5s| 1 | 0 | 1111 | - | 21M| 0 | 6 |4268 |3217<br>
|4268 |3196 | 0 | 15 | 0 | 0.000000e+00 | -- | Inf<br>
6.7s| 1 | 0 | 1563 | - | 21M| 0 | 6 |4268 |3217<br>
|4268 |3196 | 0 | 15 | 0 | 0.000000e+00 | -- | Inf<br>
6.8s| 1 | 0 | 1575 | - | 21M| 0 | 6 |4268 |3217<br>
|4268 |3207 | 11 | 15 | 0 | 0.000000e+00 | -- | Inf<br>
--------------<br>
<br>
While NEOS output file looks like this:<br>
<br>
--------------<br>
<br>
Presolving Time: 2.54<br>
<br>
time | node | left |LP iter|LP it/n| mem |mdpt |frac |vars |cons |cols |rows |cuts |confs|strbr| dualbound | primalbound | gap<br>
3.8s| 1 | 0 | 1060 | - | 21M| 0 | 6 |4268 |3217 |4268 |3196 | 0 | 15 | 0 | 0.000000e+00 | -- | Inf<br>
<br>
******************************<u></u>******************************<u></u>******************<br>
This program contains Ipopt, a library for large-scale nonlinear optimization.<br>
Ipopt is released as open source code under the Eclipse Public License (EPL).<br></div></div>
For more information visithttp://<a href="http://projects.coin-or.org/Ipopt" target="_blank">projects.coin-or.<u></u>org/Ipopt</a><div class="im"><br>
******************************<u></u>******************************<u></u>******************<br>
<br>
q 6.2s| 1 | 0 | 1138 | - | 21M| 0 | - |4268 |3217 |4268 |3196 | 0 | 15 | 0 | 0.000000e+00 | 0.000000e+00 | 0.00%<br>
6.2s| 1 | 0 | 1138 | - | 21M| 0 | - |4268 |3217 |4268 |3196 | 0 | 15 | 0 | 0.000000e+00 | 0.000000e+00 | 0.00%<br>
<br>
--------------<br>
<br>
Do you know why I cannot reproduce such results? Might I be missing<br>
something, like the IPOPT nonlinear solver?<br>
<br>
Thank you very much,<br>
Cristiano<br>
<br>
<br>
<br>
<br>
On Sat, Sep 28, 2013 at 4:30 PM, Cristiano Arbex <<a href="mailto:crisarbex@gmail.com" target="_blank">crisarbex@gmail.com</a><br></div><div class="im">
<mailto:<a href="mailto:crisarbex@gmail.com" target="_blank">crisarbex@gmail.com</a>>> wrote:<br>
<br>
Thank you very much, Stefan, that was very helpful.<br>
<br>
<br>
On Sat, Sep 28, 2013 at 2:06 PM, Stefan Vigerske<br></div><div class="im">
<<a href="mailto:stefan@math.hu-berlin.de" target="_blank">stefan@math.hu-berlin.de</a> <mailto:<a href="mailto:stefan@math.hu-berlin.de" target="_blank">stefan@math.hu-berlin.<u></u>de</a>>> wrote:<br>
<br>
Hi,<br>
<br>
what is not supported so far is to set SCIP options via the AMPL<br>
script language.<br>
However, AMPL/SCIP reads by default SCIP options from the file<br>
scip.set, if present.<br>
<br>
Alternatively, one can specify a SCIP settings file as argument<br>
to the AMPL/SCIP binary. However, that would require to write<br>
out the AMPL model as .nl file first and to run the binary<br>
explicitly, e.g.,<br></div>
./bin/scipampl <a href="http://foo.nl" target="_blank">foo.nl</a> <<a href="http://foo.nl" target="_blank">http://foo.nl</a>> myoptions.set<div class="im"><br>
<br>
Btw, adding "-i" to the command line arguments gives you the<br>
SCIP interactive shell.<br>
<br>
Hope that helps,<br>
Stefan<br>
<br>
<br>
<br>
On 09/28/2013 01:55 PM, Cristiano Arbex wrote:<br>
<br>
I am trying to use SCIP with its interface to AMPL, which I<br>
installed on<br>
Linux via this following tutorial:<br>
<br></div>
<a href="http://zverovich.net/2012/08/__07/using-scip-with-ampl.html" target="_blank">http://zverovich.net/2012/08/_<u></u>_07/using-scip-with-ampl.html</a><div class="im"><br>
<<a href="http://zverovich.net/2012/08/07/using-scip-with-ampl.html" target="_blank">http://zverovich.net/2012/08/<u></u>07/using-scip-with-ampl.html</a>><br>
<br>
<br>
In the tutorial it is said that no SCIP options are<br>
currently supported. Do<br>
you know if there is a way to use options with AMPL or if<br>
there is an<br>
alternate way to do this, for example, by presenting an<br>
options file?<br>
<br>
Thank you very much,<br>
Cristiano<br>
<br>
<br>
<br></div>
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</div></blockquote><span class="HOEnZb"><font color="#888888">
<br>
-- <br>
______________________________<u></u>______________________________<br>
Ambros M. Gleixner<br>
Zuse Institute Berlin - Matheon - Berlin Mathematical School<br>
<a href="http://www.zib.de/gleixner" target="_blank">http://www.zib.de/gleixner</a></font></span><div class="HOEnZb"><div class="h5"><br>
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