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

[Stefan Vigerske]

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
>