Charitha Heendeniya
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Recent activity by Charitha Heendeniya-
Question about linearization
AnsweredHello, This might be a simple question, but I want to really understand what is going on behind the scene. I'm trying to linearize a product between a binary and a continuous variable. The binary v...
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ComputeIIS and how to use it to troubleshoot
AnsweredHello, community, Please check the following output from the ComputeIIS. From these results, I see that one of these constraints may be causing infeasibility in my model. But I already know for a f...
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Question about ConcurrentMIP
AnsweredI understand that ConcurrentMIP lets the solver perform parallel searches along the branch and bound tree for a MIP problem. Suppose one such search finds an incumbent solution, meaning any branch ...
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Modeling problem about using variable value for indexing and conditional summation
AnsweredDear all, Please have a look at the example below. This is not programmatically correct, but I want to show the idea and get your thoughts on implementing it in Gurobi. start_time = {n: t for n, t ...
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Re-optimization with a partial solution and new constraints
AnsweredHello all, I'm testing a re-optimization method that goes as follows. Initialize model model.solve() --> solution stored as model.sol Edit model.sol by removing solutions to some variables (incl. ...
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Multiple callbacks question
AnsweredI want to know if I can create a MIPSOL callback routine like the one below. Where MIPSOL: Add a lazy constraint to the model, Check if the incumbent solution is still feasible, If feasible: get t...
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General tips for using Lazy constraints
AnsweredDear all, I want to start this thread to share tips/ suggestions for using lazy constraints (using the attribute or callback). Below I share some of my experiences on this, and I would like if othe...
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About MemLimit
AnsweredDear all, I'm trying to use MemLimit parameter e = Env("gurobi.log", params={'MemLimit': 31, 'PreSparsify': 1, 'MIPFocus': 3, ...
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Constraint for a max, number of overlapping tasks
OngoingI'm trying to write a constraint (for a task scheduling problem) where I want to say "a maximum of n tasks can overlap". I have the following variables, x(i, j): Task j follows task i (variable) T(...
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What is phase 1 solution?
AnsweredDear community, Below is a screenshot of a section of the log produced by Gurobi. I want to understand what this means, especially what a phase-1 solution is, and how I can use that information. I ...