GRBQConstr#

GRBQConstr#

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 GRBModel.AddQConstr), rather than by using a GRBQConstr constructor.

The methods on quadratic constraint objects are used to get and set quadratic constraint attributes. For example, quadratic constraint right-hand sides can be queried by calling Get (GRB.DoubleAttr.QCRHS). Note, however, that it is generally more efficient to query attributes for a set of constraints at once. This is done using the attribute query method on the GRBModel object (GRBModel.Get).

char Get(GRB.CharAttr attr)#

Query the value of a char-valued quadratic constraint attribute.

Parameters:

attr – The attribute being queried.

Returns:

The current value of the requested attribute.

double Get(GRB.DoubleAttr attr)#

Query the value of a double-valued quadratic constraint attribute.

Parameters:

attr – The attribute being queried.

Returns:

The current value of the requested attribute.

int Get(GRB.IntAttr attr)#

Query the value of an int-valued quadratic constraint attribute.

Parameters:

attr – The attribute being queried.

Returns:

The current value of the requested attribute.

string Get(GRB.StringAttr attr)#

Query the value of a string-valued quadratic constraint attribute.

Parameters:

attr – The attribute being queried.

Returns:

The current value of the requested attribute.

void Set(GRB.CharAttr attr, char newvalue)#

Set the value of a char-valued quadratic constraint attribute.

Parameters:

  • attr – The attribute being modified.

  • newvalue – The desired new value of the attribute.

void Set(GRB.DoubleAttr attr, double newvalue)#

Set the value of a double-valued quadratic constraint attribute.

Parameters:

  • attr – The attribute being modified.

  • newvalue – The desired new value of the attribute.

void Set(GRB.IntAttr attr, int newvalue)#

Set the value of an int-valued quadratic constraint attribute.

Parameters:

  • attr – The attribute being modified.

  • newvalue – The desired new value of the attribute.

void Set(GRB.StringAttr attr, string newvalue)#

Set the value of a string-valued quadratic constraint attribute.

Parameters:

  • attr – The attribute being modified.

  • newvalue – The desired new value of the attribute.