Ronald van der Velden
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Activity overview
Latest activity by Ronald van der Velden-
Ronald van der Velden commented,
Hi, I would take a different interpretation of the binary variables. When you set variable A(x,y)=1 then you would mean that the top-left corner of a plate A, is placed at (x,y). In your example, l...
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Ronald van der Velden commented,
Hi, I believe you cannot split the problem in these two steps. While the plates selected in image 2 might be sufficient in theory (e.g. the sum of the areas matches the wall), but there is no guara...
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Ronald van der Velden commented,
Hi Harsh, Thanks a lot for the additional background info! Most likely, the reason is the following. Gurobi v11 supports univariate non-linear expressions. Trees of expressions (e.g. z = sin(y + ex...
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Ronald van der Velden commented,
Hi Harsh, Thanks for posting here! Where exactly does this error occur, can you share a code snippet? It seems to be on the JuMP side so I'm wondering if the error is Gurobi-related or not. Kind re...
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Ronald van der Velden commented,
Hi Quin, Not exactly sure what's causing this. One silly trick I've used several times for debugging, is to literally receive the GRB_LICENSE_FILE environment variable from within Python and then t...
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Ronald van der Velden commented,
Hi Johnpaul, We don't have a full example available. However, once you have the code for constructing and solving the full model, the changes are relatively small. Here are the tricks you need: Af...
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Ronald van der Velden commented,
Hi Sergei, Have you looked into indicator constraints already? You could create a single binary variable. Then you create one indicator constraint saying if my binary is 0 then constraint 1 must ho...
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Ronald van der Velden commented,
Hi Quin! These are interesting, but also broad questions :-) I'll just share the first that comes to mind, but others may have additional ideas and you may want to add details to guide us in the ri...
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Ronald van der Velden commented,
In addition to the above - to answer your last question explicitly: No, that approach won't work since both parts of the objective use the same index 0. If they would use a different index (0, 1) f...
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Ronald van der Velden commented,
Hi Lorenz, You mentioned "Since my whole model is very complex for large model". Does this mean the model formulation is as above, but runtime increases as you add workers/shifts/days? Can you give...