OverviewGroupTreeGraphIndexConcepts
NO FRAMES

CPXpreaddrows

int CPXPUBLIC CPXpreaddrows(CPXCENVptr env, CPXLPptr lp, int rcnt, int nzcnt, const double * rhs, const char * sense, const int * rmatbeg, const int * rmatind, const double * rmatval, char ** rowname)
Definition file: cplex.h
Include files: cplex.h
Note

This is an advanced routine. Advanced routines typically demand a profound understanding of the algorithms used by ILOG CPLEX. Thus they incur a higher risk of incorrect behavior in your application, behavior that can be difficult to debug. Therefore, ILOG encourages you to consider carefully whether you can accomplish the same task by means of other Callable Library routines instead.

The routine CPXpreaddrows is used to add rows to an LP problem object and its associated presolved LP problem object. Note that the CPLEX parameter CPX_PARAM_REDUCE must be set to CPX_PREREDUCE_PRIMALONLY (1) or CPX_PREREDUCE_NOPRIMALORDUAL (0) at the time of the presolve in order to add rows and preserve the presolved problem. This routine should be used in place of CPXaddrows) when you want to preserve the presolved problem.

The arguments of CPXpreaddrows are the same as those of CPXaddrows, with the exception that new columns may not be added, so there are no ccnt and colname arguments. The new rows are added to both the original LP problem object and the associated presolved LP problem object.

Examples:

 status = CPXpreaddrows (env, lp, rcnt, nzcnt, rhs, sense, rmatbeg, rmatind,
                         rmatval, newrowname);

See also the example adpreex1.c in the standard distribution.

Returns:

The routine returns zero on success and nonzero if an error occurs.