CPLEX error: list index out of range

Niko Sido

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Feb 25, 2021, 12:49:51 PM2/25/21

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Latest CPLEX studio 20.1 (CPLEX 12.9)release seem to have a problem with running as a default PyOMO solver. A model example:

import pyomo.environ as pyo

model = pyo.ConcreteModel()

model.x = pyo.Var([1,2], domain=pyo.NonNegativeReals)

model.OBJ = pyo.Objective(expr = 2*model.x[1] + 3*model.x[2])

model.Constraint1 = pyo.Constraint(expr = 3*model.x[1] + 4*model.x[2] >= 1)

instance = model.create_instance()

opt = pyo.SolverFactory('cplex')

opt.solve(instance)

PyOMO complains complains:

objective_value = (tokens[0].split('=')[1].strip()).lstrip("\"").rstrip("\"")

IndexError: list index out of range

Has anyone saw something similar and found a fix?

Siirola, John D

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Feb 25, 2021, 1:36:46 PM2/25/21

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Which version of Pyomo are you using? I believe that 12.9 compatibility was resolved in Pyomo 5.7.3.

john

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Niko Sido

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Feb 25, 2021, 5:49:50 PM2/25/21

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It solved it -

Thank you!

Saber Talari

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Mar 9, 2021, 8:57:03 AM3/9/21

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I have faced the same problem. How did you fix it?

Thanks -

Saber

Niko Sido

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Mar 9, 2021, 9:26:15 AM3/9/21

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Just updating PyOMO to the latest release fixed the problem for CPLEX 12.9; you at have CPLEX 12.10 though

Sent from my iPhone

On Mar 9, 2021, at 7:57 AM, Saber Talari <saber....@gmail.com> wrote:

I have faced the same problem. How did you fix it?

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