MPQuadraticObjective

[Emmanuel Seve]

Hi all,

I'm searching an example in Java with a quadratic objective function.

I didn't found one so far. 

I'm using the MP-solver with the SAT backend.

I wonder if the quadradic objetcive works with the SAT backend since there 

is only integer variables ? I have the possibility to use the GLOP backend (so with only double variable) if needed.

Emmanuel

[Laurent Perron]

Glop is a linear simplex solver. So no quadratic.

SAT supports quadratic objective, but only discrete variables, but not through the proto API :-(

Laurent Perron | Operations Research | lpe...@google.com | (33) 1 42 68 53 00

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[Emmanuel Seve]

Encore merci Laurent pour cette réponse super rapide

So what is the solution to use MPQuadraticObjective defined here :

https://google.github.io/or-tools/cpp_linear/classoperations__research_1_1_m_p_quadratic_objective.html

?

[Laurent Perron]

option 1: Fill the proto manually. Solve with MPSolver::SolveWithProto(model_request, &response).

It only works with SCIP and Gurobi.

option 2: use the CP-SAT API directly with the AddMultiplicationEquality() method.

Laurent Perron | Operations Research | lpe...@google.com | (33) 1 42 68 53 00

To view this discussion on the web visit https://groups.google.com/d/msgid/or-tools-discuss/81c9b0ad-6e99-498e-a740-4a70fb894736n%40googlegroups.com.