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Model.addConstr()
addConstr ( lhs, sense=None, rhs=None, name="" )
Add a constraint to a model.
Note that this method also accepts a TempConstr as its first argument (with the constraint name as its second argument). This allows you to use operator overloading to create a variety of different constraint types. See TempConstr for more information.
Arguments:
lhs: Left-hand side for the new constraint. Can be a constant, a Var, a LinExpr, a QuadExpr, or a TempConstr.
sense: Sense for the new constraint (GRB.LESS_EQUAL, GRB.EQUAL, or GRB.GREATER_EQUAL).
rhs: Right-hand side for the new constraint. Can be a constant, a Var, a LinExpr, or a QuadExpr.
name: Name for new constraint.
Note that name will be stored as an ASCII string. Thus, a name
like 'A
B' will produce an error, because
'' can not be represented as an ASCII character. Note
also that names that contain spaces are strongly discouraged,
because they can't be written to LP format files.
Return value:
New constraint object.
Example usage:
model.addConstr(x + 2*y, GRB.EQUAL, 3*z, "c0") model.addConstr(x + y <= 2.0, "c1") model.addConstr(x*x + y*y <= 4.0, "qc0") model.addConstr(x + y + z == [1, 2], "rgc0") model.addConstr(z == and_(x, y, w), "gc0") model.addConstr(z == min_(x, y), "gc1") model.addConstr((w == 1) >> (x + y <= 1), "ic0")
- Warning
- A constraint can only have a single comparison operator.
While 1 <= x + y <= 2 or 1 <= x[i] + y[i] <= 2 for i in range(3)
may look like valid constraints, our Python API won't interpret them as they were intended, which will almost
certainly result in unexpected behavior.
