 # Sagnik Basumallik   • Total activity 37
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## Activity overview

Latest activity by Sagnik Basumallik
• Sagnik Basumallik commented,

Hi Jaromił, I tried two different ways: 1. First, I tried writing $\textrm{trace}A'BA$ as $\textrm{trace}BAA'$ and then computing $\textrm{trace}BM$ where $M=AA'$ computed offline. This still took ...

• Sagnik Basumallik commented,

Hi Jaromił, Thank you for your help. I think there was one thing that I missed mentioning is that in the expression trace(A^TBA), matrix B is a matrix with Gurobi variables on the diagonal. Ex, B =...

• Sagnik Basumallik created a post,

### Error when using Sparse matrix with Gurobi variables

Ongoing

Hi, I have a dense matrix H which I have transformed into a sparse matrix. from scipy import sparsesH = sparse.csr_matrix(H) I have a D matrix which is an identity matrix with Gurobi variables in t...

• Sagnik Basumallik created a post,

### Creating model takes too much time when big matrices are used

Hi All I have a problem that minimizes the following: minimize trace(A^TBA) where the matrices A and B have the following dimension A = (3038 x 2000) B = (3038 x 3038) I write the objective functio...

• Sagnik Basumallik created a post,

### Duality of MILP

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...

• Sagnik Basumallik created a post,

### Tolerances for Floating Point numbers under Integer Relaxation

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) ...

• Sagnik Basumallik created a post,

### How does Gurobi handle binary variables in Mixed Integer (Binary) Linear Program?

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...

• Sagnik Basumallik commented,

Thank you Dr. Yuriy Zinchenko. I did figure this out later after reading "multi-objective optimization in theory and practice: classical methods 1"

• Sagnik Basumallik commented,

Let us say we have the following: m.setObjective(w1*obj1+w2*obj2+w3*obj3) or m.setObjectiveN(obj1, index = 1, priority = 4, abstol=5.0) m.setObjectiveN(obj2, index = 2, priority = 3, abstol=4.0) m....

• Sagnik Basumallik created a post,