How to check conditional constraints added to the model?

回答済み

Saeid Ghafouri

2023年03月05日 20:28 編集済み

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Hi Gurobi Community,

I want to know how I can check constraints like https://www.gurobi.com/documentation/current/refman/py_model_agc_indicator.html in my model using something like model.disply() function. E.g. for the following dummy example:

import gurobipy as gp

model = gp.Model()

x = model.addVar(vtype=gp.GRB.BINARY, name="x")
y = model.addVar(vtype=gp.GRB.BINARY, name="y")
a = model.addVar(vtype=gp.GRB.BINARY, name="a")


z = model.addVar(vtype=gp.GRB.CONTINUOUS, name="z", ub=30)
model.addGenConstrAnd(a, [x, y], "andconstr")

model.update()

# constr1 = model.addConstr(z <= 20)
constr2 = model.addConstr((a == 0) >> (z <= 5))

model.setObjective(z+x+y+a, gp.GRB.MAXIMIZE)

model.update()
# Solve the model
model.optimize()
model.display()

calling model.display() will only show me the following:

Maximize
  x + y + a + z
Subject To
Bounds
  0 <= z <= 30
Binaries
  ['x', 'y', 'a']

and it dos not show anything regarding:

model.addGenConstrAnd(a, [x, y], "andconstr")

or:

constr2 = model.addConstr((a == 0) >> (z <= 5))

Is there a way to see such information in Gurobi model.display() or some similar function?

関連

• Python

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  Riley Clement

  • Gurobi Staff

  2023年03月07日 10:03 編集済み

  Hi Saeid,

  The Model.display() function is not documented, and may possibly be removed in the near future.

  The best approach is to write the model out to LP:

  model.write("my_model.lp")

  and then inspect the output in a text editor.

  - Riley

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