Error with callback expample in python: Unable to read model

[evelyn...@ucn.cl]

Unable to open file '-f' for input

---------------------------------------------------------------------------
GurobiError                               Traceback (most recent call last)
<ipython-input-15-b36f173ce915> in <module>()
     87 # Read model from file
     88 
---> 89 model = read(sys.argv[1])
     90 
     91 # Open log file

gurobi.pxi in gurobipy.read()

gurobi.pxi in gurobipy.gurobi.read()

GurobiError: Unable to read model

[zinc...@gurobi.com]

Did you supply a valid model file name as an argument to the Python script?

[Evelyn Arrey González]

I used an example of “gurobi examples”.

It is callback.py 

This is the link: 

http://www.gurobi.com/documentation/8.1/examples/callback_py.html

El El jue, 28 de mar. de 2019 a las 17:50, zinchenko via Gurobi Optimization <gur...@googlegroups.com> escribió:

Did you supply a valid model file name as an argument to the Python script?

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Evelyn Arrey González Académico Departamento de Ingeniería Industrial Facultad de Ingeniería y Ciencias Geológicas Universidad Católica del Norte Av. Angamos 0610, of. Y1-316, Antofagasta ☏ +56 55 235 5153   ✉ evelyn.arrey@ucn.cl industrial.ucn.cl

[Michael Winkler]

Hi Evelyn,

It seems you are calling callback.py with an command line option "-f",  likely "callback.py -f mymodel.mps". The -f option is not something we use, could you please double check that you call it just like "callback.py mymodel.mps".

Best,

Michael

[Evelyn Arrey González]

Hi Michael and thanks

I try with that and i still have the same problem.

I used this code  http://www.gurobi.com/documentation/8.1/examples/callback_py.html  

and i think in this part is the error:

  

Evelyn Arrey González Académico Departamento de Ingeniería Industrial Facultad de Ingeniería y Ciencias Geológicas Universidad Católica del Norte Av. Angamos 0610, of. Y1-316, Antofagasta ☏ +56 55 235 5153   ✉ evelyn.arrey@ucn.cl industrial.ucn.cl

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[Michael Winkler]

How do you execute the script?

Best,

Michael