Tanmoy Das

Hello good people, I am working on a variant of VRP & solving it using Column Generation. The objective function of the pricing problem is my reduced cost (RC) of each route/sequence. My initial ...

Hello, I am writing a MIP model in Gurobipy. As I understand from documentation that Gurobi by default uses B&C algorithm to solve a MIP problem. How can I use another solution algorithm (if any ot...

Hello, I need to print values of objective for each iteration (not just two iterations as shown below). I think callback function could be useful. But, cant find the correct syntax. Note: it's a MI...

Hi, I have two objectives, one to maximize another one to minimize. How to tell the model that obj1 is maximization and obj2 is minimization? The below ModelSense will consider both objectives as m...

Hi, How can I implement a constraint so that resources from facility is sent to customer only when that facility is open?  select is a binary variable to send resource r from station s. deploy is a...

Hello good people, How can I correctly write/save the model.lp file to store non-binding constraints as well? When I write the model.lp file, most constraints are found formulated as expected. Howe...

Hello,  model.objval prints only the optimal objective value. But, I need values of objective function for both optimal (and non-optimal) solutions.     

Is there any API or tools in Gurobi to generate the math equation of constraints based on the Python script of that constraint? I want to get the math formula of the following constraint: model2.ad...

In my current optimization model, I have 3 binding and 6 non-binding constraint. So, I want to perform a detail sensitivity analysis to see if there is any loophole in the model formulation. Is the...

I am trying to implement a constraint of the maximal coverage problem (Equation 16.2 from the image at the bottom of this post). A minimal Python code is below.  But the code is giving me error Key...