Jakob Schelbert
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Activity overview
Latest activity by Jakob Schelbert-
Jakob Schelbert commented,
Hi Han, I'm not sure what you mean. Should the variable be fixed to that value? You can add constraints that force a variable to a certain value. While gurobi itself cannot generate random values, ...
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Jakob Schelbert commented,
Hi Astghik, you can try to set the focus http://www.gurobi.com/documentation/8.1/refman/mipfocus.html#parameter:MIPFocus or the heuristics http://www.gurobi.com/documentation/8.1/refman/heuristics....
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Jakob Schelbert commented,
Hi, you should probably check the status of the model whether gurobi determined it being infeasible and catch that situation by doing something else compared to the normal case where the model is s...
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Jakob Schelbert commented,
Hi Curt, If I'm not mistaken, you could use a partial (old) solution and try to feed it to gurobi as a start solution. Maybe your knowledge can help you to decide which variables should be the same...
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Jakob Schelbert commented,
Hi Curt, If I understand "cosmetic variations" correctly I'd have a look at symmetry breaking constraints. Maybe this helps you to get solutions that are really different from a functional point of...
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Jakob Schelbert commented,
Hi Ruchika, see http://www.gurobi.com/documentation/8.1/examples/qcp_py.html and http://www.gurobi.com/documentation/8.1/examples/qp_py.html. Note that the former is a continuous problem but you ca...
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Jakob Schelbert commented,
Hi Rasmus, To the best of my knowledge the best solution is used to cut off parts of the branch-and-bound-tree that cannot yield better solutions that the one provided. If I understand your questio...
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Jakob Schelbert commented,
Hi Tamás, Your model seems to be rather small but nontheless difficult to get a feasible solution. I'm not sure whether a Xeon Phi does aid gurobi while solving but a more potent computer (compared...
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Jakob Schelbert commented,
Hi Danylo, You wrote earlier that "I scale and center the variables to [-1,1]". I was assuming that by doing this you change the coefficients in your constraints. My suggestion would then be to jus...
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Jakob Schelbert commented,
Hi Danylo, As you already mentioned, your problem has a very wide range of matrix coefficients which makes the it numerically challenging. See http://www.gurobi.com/documentation/8.1/refman/numeric...