ILOG CPLEX C++ API 9.0 Reference Manual

IloCplex
to use for the constraint rngs[i] in order to make the model feasible. Similarly,
varlb[i] and varub[i] contain the lower and upper bound to use for variable
vars[i] in order to make the model feasible. If bounds were not allowed to be relaxed
or did not need to be relaxed in order to make the model feasible, the original bounds
are returned.
The active model is not changed by this method.
If feasOpt successfully finds a relaxation that made the model feasible, it also
installs a solution vector that would be feasible, had the model been relaxed as specified
with the returned relaxed bounds. This solution can be queried with the conventional
query methods.
When the optind parameter is IloTrue, this method also tries to find the optimal
solution of the minimally relaxed model. That is, it finds the solution that is optimal
with respect to the original objective function, but requires only minimal relaxation.
With the default setting of the parameter optind the original objective funciton is not
evaluated.
public void freePresolve()
This method frees the presolved problem. Under the default setting of parameter
Reduce, the presolved problem is freed when an optimal solution is found; however, it
is not freed if Reduce has been set to 1 (primal reductions) or to 2 (dual reductions). In
these instances, the function freePresolve can be used when necessary to free it
manually.
public IloCplex::Algorithm getAlgorithm()
This method returns the algorithm type that was used to solve the most recent model in
cases where it was not a MIP.
public void getAX(IloNumArray val,
const IloRangeArray con)
For the constraints in con, this method places the values of the expressions, or,
equivalently, the activity levels of the constraints for the current solution of the invoking
IloCplex object into the array val. Array val is resized to the same size as array
con, and val[i] will contain the slack value for constraint con[i]. All ranges in
con must be part of the extracted model.
public IloNum getAX(const IloRange range)
This method returns the value of the expression of constraint range, or, equivalently,
its activity level, for the current solution of the invoking IloCplex object. The
range must be part of the extracted model.
public IloCplex::BasisStatus getBasisStatus(const IloConstraint con)
This method returns the basis status of the implicit slack or artificial variable created for
the constraint con.
ILOG CPLEX C++ API 9.0 REFERENCE M ANUAL 58