Johannes Pelda
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Activity overview
Latest activity by Johannes Pelda-
Johannes Pelda commented,
Dear Jaromil, Thank you for helping! It turned out that changing m^2 that occurres in one constraint to a new variable m2=m*m solved the issue. However the inequality constraint still does not wor...
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Johannes Pelda commented,
Hi, changing the bounds on "div" will also not lead to a feasibility. Here you will find the computeIIS() *.ilp files: sp70rp50 - m_(p-pmin).ilp = https://cloud.hawk.de/index.php/s/TGraNz885HFajzX ...
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Johannes Pelda commented,
Dear Jaromił, thank you for your comment. I have used the approach of "How do I model multilinear terms in Gurobi" where it was meaningful, so far. The results of computeIIS() show that my bounds s...
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Johannes Pelda created a post,
Trilinear terms in objective function
AnsweredHi, I try to model a network where the users' heat demand is (m * t) = q. q is negtive and shall be minimized. Bounds of m are [10, 0] and bounds of t are [350, 270]. Bounds of q are [-10000, 0]. m...
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Johannes Pelda commented,
Dear Eli, The method model.computeIIS() is not giving any results. Moreover, it is not starting properly. It stucks when calling without error message and the CPU keeps running at full load (test 1...
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Johannes Pelda commented,
Dear Eli, Thank you very much for your instant response. I implemented your suggested approach in the model. However, it is still not feasible and gurobi says unbounded. I also added some lb and ub...
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Johannes Pelda created a post,
switch
OngoingI have the following equations: f1(m) = t1 - t1a, for m >= 0 f2(m) = t2 - t1b, for m < 0 Is there a possibility to insert a "switch" to the model as a constraint? I started with: model.addConst...