[Scip] SCIP interface with AMPL

[Stefan Vigerske]

Hi,

the SCIP makesystem should ask you for the link. Try running

  make IPOPT=true links

or just go into the scip/lib directory and do

    ln -s <ipoptbuilddir> ipopt.linux.x86_64.gnu.opt

Stefan

On 09/30/2013 05:40 PM, Cristiano Arbex wrote:
> Hi, thanls Ambros and Hans for the reply.
>
> I installed and compiled IPOPT. I am not being able to install SCIP with
> IPOPT, I tried to reinstall scip like you said:
>
> make IPOPT=true
>
> But I don't know where do I provide the link to IPOPT libraries. I get the
> error:
>
> src/nlpi/nlpi_ipopt.cpp:45:25: fatal error: IpoptConfig.h: No such file or
> directory
> compilation terminated.
> make[2]: *** [obj/O.linux.x86_64.gnu.opt/lib/nlpi/nlpi_ipopt.o] Error 1
>
> Do you know how to proceed?
>
> Thank you very much and sorry if this is stupid,
> Cristiano
>
>
>
> On Mon, Sep 30, 2013 at 4:01 PM, Ambros Gleixner <gleixner at zib.de> wrote:
>
>> Hi Cristiano,
>>
>> 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.
>>
>> Best regards,
>>
>> Ambros
>>
>>
>>
>> Am 30.09.2013 16:55, schrieb Cristiano Arbex:
>>
>>> Hi again,
>>>
>>> I've been using the NEOS server to test SCIP and I've been impressed
>>> with its speed. I tried solving 36 nonlinear instances and the largest
>>> one can be downloaded here:
>>>
>>> https://docs.google.com/file/**d/**0B4Rt5z2PACNndUZUc184dVBxQVU/**
>>> edit?usp=sharing<https://docs.google.com/file/d/0B4Rt5z2PACNndUZUc184dVBxQVU/edit?usp=sharing>
>>>
>>> It takes NEOS SCIP 6 seconds to solve it. I am using the same scip.set
>>> parameters file that can be found on NEOS. I installed the SCIP
>>> optimization suite following the steps in the link provided in the first
>>> message of this thread.
>>>
>>> I know my PC is slower than the NEOS server but SCIP on my PC has been
>>> solving the same instance for 1200s. In the output file I get this
>>> message:
>>>
>>> --------------
>>> Presolving Time: 4.20
>>> Quadratic constraint handler does not have LAPACK for eigenvalue
>>> computation. Will assume that matrices (with size > 2x2) are indefinite.
>>>
>>>    time | node  | left  |LP iter|LP it/n| mem |mdpt |frac |vars |cons
>>> |cols |rows |cuts |confs|strbr|  dualbound   | primalbound  |  gap
>>>     6.5s|     1 |     0 |  1111 |     - |  21M|   0 |   6 |4268 |3217
>>> |4268 |3196 |   0 |  15 |   0 | 0.000000e+00 |      --      |    Inf
>>>     6.7s|     1 |     0 |  1563 |     - |  21M|   0 |   6 |4268 |3217
>>> |4268 |3196 |   0 |  15 |   0 | 0.000000e+00 |      --      |    Inf
>>>     6.8s|     1 |     0 |  1575 |     - |  21M|   0 |   6 |4268 |3217
>>> |4268 |3207 |  11 |  15 |   0 | 0.000000e+00 |      --      |    Inf
>>> --------------
>>>
>>> While NEOS output file looks like this:
>>>
>>> --------------
>>>
>>> Presolving Time: 2.54
>>>
>>>    time | node  | left  |LP iter|LP it/n| mem |mdpt |frac |vars |cons
>>> |cols |rows |cuts |confs|strbr|  dualbound   | primalbound  |  gap
>>>     3.8s|     1 |     0 |  1060 |     - |  21M|   0 |   6 |4268 |3217
>>> |4268 |3196 |   0 |  15 |   0 | 0.000000e+00 |      --      |    Inf
>>>
>>> ****************************************************************
>>> ******************
>>> This program contains Ipopt, a library for large-scale nonlinear
>>> optimization.
>>>    Ipopt is released as open source code under the Eclipse Public License
>>> (EPL).
>>>            For more information visithttp://projects.coin-or.**org/Ipopt<http://projects.coin-or.org/Ipopt>
>>>
>>> ****************************************************************
>>> ******************
>>>
>>> q 6.2s|     1 |     0 |  1138 |     - |  21M|   0 |   - |4268 |3217 |4268
>>> |3196 |   0 |  15 |   0 | 0.000000e+00 | 0.000000e+00 |   0.00%
>>>     6.2s|     1 |     0 |  1138 |     - |  21M|   0 |   - |4268 |3217
>>> |4268 |3196 |   0 |  15 |   0 | 0.000000e+00 | 0.000000e+00 |   0.00%
>>>
>>> --------------
>>>
>>> Do you know why I cannot reproduce such results? Might I be missing
>>> something, like the IPOPT nonlinear solver?
>>>
>>> Thank you very much,
>>> Cristiano
>>>
>>>
>>>
>>>
>>> On Sat, Sep 28, 2013 at 4:30 PM, Cristiano Arbex <crisarbex at gmail.com
>>> <mailto:crisarbex at gmail.com>> wrote:
>>>
>>>      Thank you very much, Stefan, that was very helpful.
>>>
>>>
>>>      On Sat, Sep 28, 2013 at 2:06 PM, Stefan Vigerske
>>>      <stefan at math.hu-berlin.de <mailto:stefan at math.hu-berlin.**de<stefan at math.hu-berlin.de>>>
>>> wrote:
>>>
>>>          Hi,
>>>
>>>          what is not supported so far is to set SCIP options via the AMPL
>>>          script language.
>>>          However, AMPL/SCIP reads by default SCIP options from the file
>>>          scip.set, if present.
>>>
>>>          Alternatively, one can specify a SCIP settings file as argument
>>>          to the AMPL/SCIP binary. However, that would require to write
>>>          out the AMPL model as .nl file first and to run the binary
>>>          explicitly, e.g.,
>>>             ./bin/scipampl foo.nl <http://foo.nl> myoptions.set
>>>
>>>
>>>          Btw, adding "-i" to the command line arguments gives you the
>>>          SCIP interactive shell.
>>>
>>>          Hope that helps,
>>>          Stefan
>>>
>>>
>>>
>>>          On 09/28/2013 01:55 PM, Cristiano Arbex wrote:
>>>
>>>              I am trying to use SCIP with its interface to AMPL, which I
>>>              installed on
>>>              Linux via this following tutorial:
>>>
>>>              http://zverovich.net/2012/08/_**_07/using-scip-with-ampl.html<http://zverovich.net/2012/08/__07/using-scip-with-ampl.html>
>>>
>>>              <http://zverovich.net/2012/08/**07/using-scip-with-ampl.html<http://zverovich.net/2012/08/07/using-scip-with-ampl.html>
>>>>
>>>
>>>
>>>              In the tutorial it is said that no SCIP options are
>>>              currently supported. Do
>>>              you know if there is a way to use options with AMPL or if
>>>              there is an
>>>              alternate way to do this, for example, by presenting an
>>>              options file?
>>>
>>>              Thank you very much,
>>>              Cristiano
>>>
>>>
>>>
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>>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
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>> --
>> ______________________________**______________________________
>> Ambros M. Gleixner
>> Zuse Institute Berlin - Matheon - Berlin Mathematical School
>> http://www.zib.de/gleixner
>>
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>>
>
>
>
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