Originally posted by: RaguNasu

I want add gomery cut by myself.
So I need to use CPXbinvarow.
But I don't know how to use.
ILOG Optimization Documentation don't have enough example.
I want a sample code by c++.(really c++ example)
My concert is concert21.

Thanks.
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#DecisionOptimization

Originally posted by: QiuFeng

here is the function in my code printing tableau, hope it help.

int OptModel::printTableau(string tableauFileName)
{
                int num_rows = CPXgetnumrows(cpxenv,  cpxlp);
                int num_cols  = CPXgetnumcols(cpxenv,  cpxlp) ; // need to know why
                int surplus;
                vector<string> varNames;
 
                int status = CPXgetcolname (cpxenv, cpxlp, NULL, NULL, 0, &surplus, 0,num_cols-1);
                int cur_colnamespace = - surplus;
                if ( cur_colnamespace > 0 ) {
                        char          **cur_colname      = (char **) malloc (sizeof(char *)*(num_cols));
                        char          *cur_colnamestore = (char *)  malloc (cur_colnamespace);
                        if ( cur_colname      == NULL ||
                                cur_colnamestore == NULL   ) {
                                        fprintf (stderr, "Failed to get memory for column names.\n");
                                        status = -1;
                                        cout<< endl <<" error in printTableau"<<endl;
                                        return 0;
                        }
                        status = CPXgetcolname (cpxenv, cpxlp, cur_colname, cur_colnamestore, 
                                cur_colnamespace, &surplus, 0, num_cols-1);
                        // map name with column index
                        for (int i = 0; i <num_cols ; i ++)
                        {
                                string varName = cur_colname[i];
                                varNames.push_back(varName);
                        }
                        free_and_null(cur_colname);
                        // free_and_null((char **)&cur_colnamestore);
 
                }
 
                /***************get head ****************************/
                int* head = new int[num_rows]; // head is the 0-th column of the tableau
                double *head_val = new double[num_rows];
                status = CPXgetbhead (cpxenv, cpxlp, head, head_val);
 
                ofstream log(tableauFileName.c_str() ,ios_base::app);
                streambuf * old_buf = std::cout.rdbuf(log.rdbuf()); 
 
                double *objval_p = new double;
                status = CPXgetobjval(cpxenv, cpxlp,  objval_p);
                cout<<"objective value, " << *objval_p<<endl;
 
                double* tabealu;
                tabealu = (double*)malloc(num_rows*num_cols*sizeof(double));
                for (int i = 0; i < num_rows; i++)
                {
                        CPXbinvarow(cpxenv, cpxlp, i, tabealu+i*num_cols);
                }
 
                cout << endl;
                cout << "Tableau, x, " ;
                for ( int j = 0; j < num_cols ; j ++)
                {
                        cout << varNames[j] << ", ";
                }
                cout << endl;
                for (int i = 0; i < num_rows; i++)
                {
                        if (head[i] < 0)
                        {
                                cout << head[i] <<", " << head_val[i]<< ", ";
                        }
                        else{
                                cout << varNames[head[i]] <<", " << head_val[i]<< ", ";
                        }
                        for (int j = 0; j < num_cols ; j ++)
                        {
                                cout << tabealu[i*num_cols +j] << ", " ;
                        }
                        cout<<endl;
                }
                cout << endl;
                cout.rdbuf( old_buf);
 
                delete []head;
                delete []head_val;
                delete objval_p;
                free_and_null((char**) &tabealu);
                return 1;
 
}

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#DecisionOptimization

Originally posted by: QiuFeng

sorry, I didn't notice that you want a c++ example, I haven't found the corresponding functions in Concert.
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Originally posted by: RaguNasu

IS cpxlp ILOCPLEX or ILOMODEL?
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Originally posted by: QiuFeng

it's IloCplex.
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Originally posted by: QiuFeng

I should say, it's CPXLPptr which corresponds to IloCplex
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