Python-MIP: collection of Python tools for the modeling and solution of Mixed-Integer Linear programs
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SEGFAULT after adding empty rows and defining coefficients later via column parameter of method add_var #184
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peterlietz opened 3 years ago
Describe the bug Process finished with exit code 139 (interrupted by signal 11: SIGSEGV)
To Reproduce import mip
m = mip.Model("column_test", sense=mip.MAXIMIZE, solver_name=mip.CBC)
c1 = m.add_constr(mip.LinExpr(const=-10, sense=mip.LESS_OR_EQUAL), name="c1") c2 = m.add_constr(mip.LinExpr(const=-10, sense=mip.LESS_OR_EQUAL), name="c2") c3 = m.add_constr(mip.LinExpr(const=-10, sense=mip.LESS_OR_EQUAL), name="c3") a1 = m.add_var(name="a1", obj=1, column=mip.Column(constrs=[c1, c2], coeffs=[1., 1.])) a2 = m.add_var(name="a2", obj=1, column=mip.Column(constrs=[c1, c3], coeffs=[1., 1.])) a3 = m.add_var(name="a3", obj=1, column=mip.Column(constrs=[c2, c3], coeffs=[1., 1.]))
m.write("prob.lp")
Expected behavior The coefficients are added to the rows when the variables are created and the model is correctly written to file.
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