[Scip] Using SCIP included in another source code to solve quadratic constraints

[Jiehua Chen]

Hi,

Yes. The problem was that the symbolic link should start from some other 
directory than the one when you "make". The hint in the INSTALL was not 
very helpful. Nevertheless, I still don't get the result after 10 hours 
(using ipopt):



******************************************************************************
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 visit http://projects.coin-or.org/Ipopt
******************************************************************************

   0.0s|     1 |     2 |     0 |     - | 220k|   0 |   0 |  12 |   9 | 
12 |   0 |   0 |   0 |   0 | 1.000000e+00 |      --      |    Inf
   0.4s|   100 |    91 |   662 |   6.7 | 307k|  55 |   - |  12 |   9 | 
  0 |   0 | 633 |   0 |   0 | 1.000000e+00 |      --      |    Inf
   0.5s|   200 |   171 |  1503 |   7.6 | 403k|  81 |   0 |  12 |   9 | 
12 |   0 |1222 |   0 |   0 | 1.000000e+00 |      --      |    Inf
   0.5s|   300 |   257 |  3265 |  10.9 | 574k|  81 |   - |  12 |   9 | 
12 | 113 |2711 |   0 |   0 | 1.000000e+00 |      --      |    Inf
   0.7s|   400 |   341 |  6199 |  15.5 | 902k| 101 |   0 |  12 |   9 | 
12 |  93 |5072 |   0 |   0 | 1.000000e+00 |      --      |    Inf
   0.9s|   500 |   437 | 10677 |  21.4 |1138k| 114 |   0 |  12 |   9 | 
12 |   0 |8380 |   0 |   0 | 1.000000e+00 |      --      |    Inf
   1.0s|   600 |   531 | 11329 |  18.9 |1239k| 114 |   0 |  12 |   9 | 
12 |  98 |8906 |   0 |   0 | 1.000000e+00 |      --      |    Inf


What's going wrong?

Best,
Jiehua Chen

On 04/13/2015 02:10 PM, Stefan Vigerske wrote:
> Hi,
>
> probably the symlink to the SoPlex source was not set correctly when you
> called make the first time.
> Just make sure that lib/spxinc points to the soplex src directory.
>
> Stefan
>
>
> On 04/13/2015 01:25 PM, Jiehua Chen wrote:
>> Hi,
>>
>> I encounter the following error message when trying to compile:
>>
>> compiling obj/O.linux.x86_64.gnu.opt/lib/lpi/lpi_spx.o
>> src/lpi/lpi_spx.cpp:76:23: fatal error: spxsolver.h: No such file or
>> directory
>>   #include "spxsolver.h"
>>
>> Can you give me more hints?
>>
>> Best
>> Jiehua
>>
>>
>> On 04/08/2015 03:09 PM, Stefan Vigerske wrote:
>>> Hi,
>>>
>>> it also takes long for me if I disable the subnlp primal heuristic. This
>>> primal heuristic is also off if you build SCIP without Ipopt. If that is
>>> the case for you, then you might want to consider rebuiling SCIP with
>>> Ipopt (see documentation on hints how to do this).
>>>
>>> Best,
>>> Stefan
>>>
>>> On 04/08/2015 02:49 PM, Jiehua Chen wrote:
>>>> Dear all,
>>>>
>>>> I have a quadratic constraint problem which I try to solve by using
>>>> SCIP
>>>> (as a library) in C++. However, my program does not terminate after 1
>>>> hour. Curiously, if I use your online solver
>>>>
>>>>   http://www.neos-server.org/neos/solvers/go:scip/CPLEX.html
>>>>
>>>> , then after several seconds I got the solution. Can you please help
>>>> me?
>>>> Thanks!
>>>>
>>>> Below is the problem:
>>>>
>>>> -------------------------------------------------------------------
>>>> minimize y#1
>>>>
>>>>
>>>> subject to
>>>> a#1 = 0
>>>> a#2 = 0
>>>>
>>>> [a#1^2 + a#2^2 - 2 a#1*v#11 - 2 a#2*v#12 - b#1^2 - b#2^2 + 2 b#1*v#11 +
>>>> 2 b#2*v#12] + y#1 <= 0
>>>> [b#1^2 + b#2^2 - 2 b#1*v#11 - 2 b#2*v#12 - c#1^2 - c#2^2 + 2 c#1*v#11 +
>>>> 2 c#2*v#12] + y#1 <= 0
>>>> [c#1^2 + c#2^2 - 2 c#1*v#11 - 2 c#2*v#12 - d#1^2 - d#2^2 + 2 d#1*v#11 +
>>>> 2 d#2*v#12] + y#1 <= 0
>>>>
>>>> [b#1^2 + b#2^2 - 2 b#1*v#21 - 2 b#2*v#22 - c#1^2 - c#2^2 + 2 c#1*v#21 +
>>>> 2 c#2*v#22] + y#1 <= 0
>>>> [c#1^2 + c#2^2 - 2 c#1*v#21 - 2 c#2*v#22 - d#1^2 - d#2^2 + 2 d#1*v#21 +
>>>> 2 d#2*v#22] + y#1 <= 0
>>>> [d#1^2 + d#2^2 - 2 d#1*v#21 - 2 d#2*v#22 - a#1^2 - a#2^2 + 2 a#1*v#21 +
>>>> 2 a#2*v#22] + y#1 <= 0
>>>>
>>>> [c#1^2 + c#2^2 - 2 c#1*v#31 - 2 c#2*v#32 - d#1^2 - d#2^2 + 2 d#1*v#31 +
>>>> 2 d#2*v#32] + y#1 <= 0
>>>> [d#1^2 + d#2^2 - 2 d#1*v#31 - 2 d#2*v#32 - a#1^2 - a#2^2 + 2 a#1*v#31 +
>>>> 2 a#2*v#32] + y#1 <= 0
>>>> [a#1^2 + a#2^2 - 2 a#1*v#31 - 2 a#2*v#32 - b#1^2 - b#2^2 + 2 b#1*v#31 +
>>>> 2 b#2*v#32] + y#1 <= 0
>>>>
>>>> y#1 >= 0.01
>>>>
>>>> end
>>>> -------------------------------------------------------------------
>>>>
>>>>
>>>> Best regards!
>>>> Jiehua Chen
>>>> _______________________________________________
>>>> Scip mailing list
>>>> Scip at zib.de
>>>> http://listserv.zib.de/mailman/listinfo/scip
>>>>
>>>
>>>
>>
>
>