What's mean "AttributeError: 'int' object has no attribute 'addConstr'"

Edgar Alan Avila Gomez

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Nov 27, 2016, 8:38:42 AM11/27/16

to Gurobi Optimization

for i in range(len(Cultivos)):

for m in range(len(Temporada)):

for j in range(Hectareas):

m.addConstr(quicksum([x[str(i)+str(j)+str(k)] * Produccion[i][m]] for k in range(Dias_de_Siembra)) >= Demanda[i][m])

.

AttributeError: 'int' object has no attribute 'addConstr'

Michael Winkler

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Nov 27, 2016, 8:44:57 AM11/27/16

to Gurobi Optimization

You use "m" as index in your second loop, so either you overwrote your model "m" that you want to reference in "m.addConstr()" or you did not use the correct model variable in this call, e.g., is should be "model.addConstr()"?!

Cheers,
Michael

Edgar Alan Avila Gomez

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Nov 27, 2016, 5:05:18 PM11/27/16

to gur...@googlegroups.com

Thanks so much,

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