I need to print all my linear constraints to verify the correctness of what I wrote but not knowing the CPLEX library for Python well I would not know how to do it.
That’s my part of LP:
import cplex problem = cplex.Cplex() problem.objective.set_sense(problem.objective.sense.minimize) names = [] upper_bounds = [] lower_bounds = [] types = [] constraint_names = [] constraints = [] for i in range(0, 12): for j in range(0, 12): names.append("x" + str(i) + "_" + str(j)) types.append(problem.variables.type.integer) upper_bounds.append(1.0) lower_bounds.append(0.0) for i in range(0, 12): names.append("y" + str(i)) types.append(problem.variables.type.integer) upper_bounds.append(1.0) lower_bounds.append(0.0) problem.variables.add(obj=objective, lb=lower_bounds, ub=upper_bounds, types = types, names=names) # Constraints for i in range(0, 22): constraint_names.append("c" + str(i)) for j in range(1, 12): variables = [] for i in range(0, 12): variables.append("x" + str(i) + "_" + str(j)) variables.append("y" + str(j)) constraints.append([variables, ([1.0] * 12) + [-1.0]]) for i in range(0, 11): variables = [] for j in range(0, 12): variables.append("x" + str(i) + "_" + str(j)) variables.append("y" + str(i)) constraints.append([variables, ([1.0] * 12) + [-1.0]]) problem.linear_constraints.add(lin_expr=constraints, senses=constraint_senses, rhs=rhs, names=constraint_names)
I want to print out these 22 linear constraints. I’m working with CPLEX 12.9 on Python 3.7.9
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Answer
This will write the Model in prob.lp:
problem.write("prob.lp")