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QConstr
Gurobi quadratic constraint object. Quadratic constraints are always
associated with a particular model. You create a quadratic constraint
object by adding a quadratic constraint to a model (using
Model.addQConstr),
rather than by using a QConstr constructor.
Quadratic constraint objects have a number of attributes. The full list can be found in the Attributes section of this document. Some constraint attributes can only be queried, while others can also be set. Recall that the Gurobi optimizer employs a lazy update approach, so changes to attributes don't take effect until the next call to Model.update, Model.optimize, Model.write on the associated model.
We should point out a few things about quadratic constraint
attributes. Consider the qcrhs attribute. Its value can be
queried using qconstr.qcrhs. The Gurobi library ignores
letter case in attribute names, so it can also be queried as
qconstr.QCRHS. It can be set using a standard assignment
statement (e.g., qconstr.qcrhs = 0). However, as mentioned
earlier, attribute modification is done in a lazy fashion, so you
won't see the effect of the change immediately. And some attributes
can not be set (e.g., the qcpi attribute), so attempts to assign
new values to them will raise an exception.
You can also use
QConstr.getAttr/
QConstr.setAttr to access
attributes. The attribute name can be passed to these routines as a
string, or you can use the constants defined in the
GRB.Attr class (e.g.,
GRB.Attr.QCRHS).
Subsections
