Infeasible Model - Model contains large matrix coefficients

Hello

I am running a model with a linear Objective Function. Here are the results:

charging_station_cost = sum((100000 * x[i]) + (3000 * y[i]) for i in I)
EV_route_cost = sum(x[0] for x in L)

# Objective
model.setObjective(charging_station_cost + EV_route_cost, sense=GRB.MINIMIZE)

model.setParam('NumericFocus', 2)
model.setParam('ScaleFlag', 2)

model.optimize()

OUTPUT:

Set parameter NumericFocus to value 2
Gurobi Optimizer version 11.0.1 build v11.0.1rc0 (mac64[arm] - Darwin 21.6.0 21G83)

CPU model: Apple M1
Thread count: 8 physical cores, 8 logical processors, using up to 8 threads

Optimize a model with 688 rows, 1360 columns and 3012 nonzeros
Model fingerprint: 0xd2b9c2b3
Variable types: 896 continuous, 464 integer (456 binary)
Coefficient statistics:
  Matrix range     [1e+00, 1e+09]
  Objective range  [3e+03, 1e+05]
  Bounds range     [1e+00, 1e+00]
  RHS range        [1e+00, 3e+02]
Warning: Model contains large matrix coefficients
Presolve removed 420 rows and 1130 columns
Presolve time: 0.00s

Explored 0 nodes (0 simplex iterations) in 0.01 seconds (0.00 work units)
Thread count was 1 (of 8 available processors)

Solution count 0

Model is infeasible
Best objective -, best bound -, gap -
NUMBER OF CONSTRAINTS: 688

The problem it seems is in MATRIX RANGE. What can you recommend?

正式なコメント

Simranjit Kaur

Gurobi Staff

2026年11月13日 01:21

This post is more than two years old. Some information may not be up to date. For current information, please check the Gurobi Documentation or Knowledge Base. If you need more help, please create a new post in the community forum, or try Gurobot, our chatbot interface offering instant, expert-level support.

Jaromił Najman

2024年08月05日 12:25

Hi Toly,

Did you have a look at the Knowledge Base article How do I determine why my model is infeasible?

Best regards,
Jaromił

Infeasible Model - Model contains large matrix coefficients

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