Binary variable having floats as results

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JohnPaul Adimonyemma

• 2024年08月14日 21:13

Hi,

 

In the past few days, when I ran my model, I observed that some of the binary variables, which I expected to take either 0 or 1, ended up sometimes taking some floats, which is shown below:

((‘T9', 'M1'), 'ST, 24) 0.9999959899878522
(('T9', M1'), 'ST', 22) 3.4349085137562096e-06
(('T9', 'M1'), 'ST, 25) 5.644126990605905e-07

(('T9', 'M1'), 'ST, 30) 1

 

I always want to ensure optimal solution; hence, I set my gap to zero. 

model.setParam(GRB.Param.MIPGap, 0)

Note that sometimes, when I rerun the model, I obtain another solution where all binary variables take 0 or 1.  

 

Can someone please help me figure out how to fix this to ensure that I always obtain 0 or 1?

0

• 

  Jaromił Najman

  Gurobi Staff

  • 2024年08月15日 08:40

  This is discussed in the Knowledge Base article Why does Gurobi sometimes return non-integral values for integer variables?

  0

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