Class IloOplCplexBasis

Definition file: ilopl/ilooplmodel.h

Utility for CPLEX warm start of LP problems.

An instance of this class can be used to save basis information for one instance of IloCplex and restore it on other instances of IloCplex.

Method Summary
`public void`	`attach(IloNumVarMap vars, IloIntMap statuses)`
`public void`	`end()`
`public IloBool`	`getBasis(IloCplex cplex)`
`public IloInt`	`getNcols() const`
`public IloInt`	`getNrows() const`
`public IloInt`	`getStatus() const`
`public`	`IloOplCplexBasis(IloEnv env)`
`public IloBool`	`setBasis(IloCplex cplex)`

IloOplCplexBasis

public IloOplCplexBasis(IloEnv env)

Constructor.

Parameters:

env	The environment to allocate memory from.

attach

public void attach(IloNumVarMap vars, IloIntMap statuses)

Attach a variable map vars to a value map statuses. After some attachments have been done, only the elements with attachments are taken into account to get/set basis.

Parameters:

vars	The variable map to be attached.
statuses	The value map.

end

public void end()

Clears the memory used by this object

getBasis

public IloBool getBasis(IloCplex cplex)

Saves basis information for a CPLEX instance.

Parameters:

cplex

Saves the basis currently available on the given CPLEX instance.

Returns:

IloTrue if the basis was successfully saved.

getNcols

public IloInt getNcols() const

Returns the number of columns in the currently saved basis.

Returns:

An integer to indicate the number of columns in the currently saved basis.

getNrows

public IloInt getNrows() const

Returns the number of rows in the currently saved basis.

Returns:

An integer to indicate the number of rows in the currently saved basis.

getStatus

public IloInt getStatus() const

Returns the CPLEX status of the last invocation of CPLEX API.

Returns:

An integer to indicate the status of the CPLEX instance.

setBasis

public IloBool setBasis(IloCplex cplex)

Restores basis information for a CPLEX instance.

Note

This utility can restore bases only if the problem of the given CPLEX instance has exactly the number of rows and columns as the problem it was taken from.

Parameters:

cplex

Restores this basis on the given CPLEX instance.

Returns:

IloTrue if the basis was successfully restored.