ilog.concert
Interface IloIntVar

public interface IloIntVar

extends IloIntExpr, IloNumVar, IloIntCollectionVar

This interface defines the API for integer variables. Objects of this type represent integer modeling variables.

Variables are characterized by their bounds and their type. The bounds can be changed later using methods setLB() and setUB(). However, the type of a variable cannot be changed after construction. The type of an integer variable will be IloNumVarType.Int throughout its lifetime.

Variables may be assigned a name using the method setName(). The name can be queried with the method getName(). Assigning a name is not required. By default, newly created variables will be created without an assigned name unless a name is specified in the construction.

Unlike other modeling objects of type IloAddable, variables cannot be added directly to a model. Variables can only be part of a model implicitly, when they are used by another modeling object such as a constraint that has been added to the model.

Integer variables are generally created using any of the following methods. Note that IloMPModeler is available to users of ILOG CPLEX.

• IloModeler.intVar()
• IloModeler.intVarArray()
• IloMPModeler.intVar()
• IloMPModeler.intVarArray()
• IloModeler.boolVar()
• IloModeler.boolVarArray()
• IloMPModeler.boolVar()
• IloMPModeler.boolVarArray()

Integer variables can also be created with the methods: IloModeler.numVar(), IloModeler.numVarArray(), IloMPModeler.numVar(), and IloMPModeler.numVarArray() by passing a parameter to variable type IloNumVarType.Int or IloNumVarType.Bool. However, this causes the compile-time information about the type of the variable to be lost. This may incur a runtime overhead when used with certain optimizers. This is documented for the optimizers only where it is relevant.

As with numerical variables, IloNumVar integer variables can be created separately or in a column-wise way. This means that when a variable is created it is immediately installed in existing modeling objects. Use objects of type IloColumn and IloColumnArray to achieve this.

See Also:

IloNumVar, IloNumVarType, IloNumExpr, IloIntExpr, IloModeler.intVar(int, int, java.lang.String), IloModeler.intVarArray(int, int, int)

Method Summary

int	getMax() Returns the initial maximum value for this integer variable.
int	getMin() Returns the initial minimum value for this integer variable.
void	setMax(int max) Sets a new initial maximum for this integer variable.
void	setMin(int min) Sets a new initial minimum for this integer variable.

Methods inherited from interface ilog.concert.IloNumVar

getLB, getName, getType, getUB, setLB, setName, setUB

Method Detail

getMin

public int getMin()
           throws IloException

Returns the initial minimum value for this integer variable.

getMax

public int getMax()
           throws IloException

Returns the initial maximum value for this integer variable.

setMin

public void setMin(int min)
            throws IloException

Sets a new initial minimum for this integer variable.

setMax

public void setMax(int max)
            throws IloException

Sets a new initial maximum for this integer variable.