Sagnik Basumallik

I am trying to understand if Gurobi derives lower bounds on the optimal solution value of a MILP problem using dual functions when Branch-and-Cut is used.  If yes, is there a way to access the dual...

I am trying to relax integer variables such that the resulting problem is linear. To do this, I am using a iterative weighted approach. The intermediate solutions I obtain (say after 6 iterations) ...

I have a Mixed Integer (Binary) Linear Program with the following variables. x = m.addVars(nodes, area,vtype=GRB.BINARY, name="x") w = m.addVars(arcs,area, vtype=GRB.BINARY, name="w") z = m.addVars...

Currently, I am solving a MOOP in Gurobi. The first way is the linearly blended method. m.setObjective(obj1+obj2+obj3) Next, I have re-write n-1 objectives using the ε-constraint method, m.addConst...

Hi, I have written a multi-objective optimization using Hierarchical formulation. m.setObjectiveN(obj1, index = 1, priority = 2, abstol=20.0)m.setObjectiveN(obj2, index = 2, priority = 1, abstol=0....

I get the following error for a constraint. Note this was working in Gurobi 8 but not in Gurobi 9. m.addConstrs(0 <= f1[i,j,h] <= 200*z[i,j] for i,j in arcs for h in area)  The full error is as fol...

I have two questions. 1. Does Gurobi support semi definite programming? 2. Is there direct support to include trace of matrix in the objective function?

I have defined a binary variable: z = m.addVars(arcs, vtype=GRB.BINARY,name="z") where arcs are (i,j). z_{i,j} = 1 means there exists a line between i and j.I want to create a matrix such that z_{i...

I am getting the following error suddenly when I try to write the LP to  a file.   Academic license - for non-commercial use onlyTraceback (most recent call last):File "C:/Users/sbasumal/PycharmPro...

Let us say we are trying to solve this problem [Source], For example, in GAMS, this can be solved as : Positive Variables x, y1, y2;Variables objout, objin; Equations defout, defin, e1, e2, e3, e4...