Originally posted by: Olivia.w

I am very, very new of using cplex with c++. I am trying to solve a problem using the column generation algorithm. But firstly I need to input data from a .csv file like this:

I have write something using IloCsvReader:

#include <ilcplex/ilocplex.h>

#include <ilconcert/ilocsvreader.h>

 

ILOSTLBEGIN

 

#define RC_EPS 1.0e-6 // optimality tolerance

 

//function of data reading

void readArray (IloIntArray ordername, char const *file)

{

    ordername.clear();

    IloCsvReader reader;

    try {

        reader = IloCsvReader(ordername.getEnv(),file);

        IloInt const lines = reader.getNumberOfItems();

        

        for (IloInt i=0; i < lines; ++i)

        {

            IloCsvLine const line = reader.getLineByNumber(i);

            

            ordername.add(IloIntArray(ordername.getEnv()));

            

            ordername[i]=line.getIntByPosition(4);

        }

        reader.end();

        

    } catch (...){

        reader.end();

        throw;

    }

}

 

int main(int argc, const char **argv) {

    

    char const *filename = "/Users/wy/Documents/Programs/PD151201/RSS3_2014-10-24.csv";

        try {

            IloEnv env;

        //************* Read Parameters *************//

        //orders

            IloIntArray ordername(env);

        readArray(ordername, filename);         

        for (IloInt i=0; i< ordername.getSize(); ++i)

        {

            cout<< ordername[i]<<endl;

        }

 

env.end();

        }

        catch (IloException& ex) {

            cerr << "Error: " << ex << endl;

        }

        catch (...) {

            cerr << "Error" << endl;

        }

    return 0;

}

 

While debug it says 

 

X& IloArray::operator[] (IloInt i) : Out of bounds operation: index superior to size of array

Assertion failed: ((i < _impl->getSize()) || (ILOSTD(cerr) << "X& IloArray::operator[] (IloInt i) : Out of bounds operation: index superior to size of array" << ILOSTD(endl), ilo_stop_assert())), function operator[], file /Applications/IBM_CPLEX/ILOG/CPLEX_Studio125/concert/include/ilconcert/iloenv.h, line 2204.

Program ended with exit code: 9

 

I have no idea what is wrong... Maybe I just did not understand the class at all...Could somebody please tell me what should I do...Thank you!

#CPLEXOptimizers
#DecisionOptimization

The problem is this line of code which most likely does not do what you want:

ordername.add(IloIntArray(ordername.getEnv()));

This line results in the following actions:

1. IloIntArray(ordername.getEnv()) creates a new empty instance of IloIntArray.
2. ordername.add(...) adds all elements from the newly created (and empty) array to ordername. See also the reference documentation.

Since adding an empty array to an empty array is a nop, ordername is still an empty array after that. Thus trying to set element 0 in that array will fail in the very first iteration of the loop since that element does not exist.

I think what you meant to write was

ordername.add(0);
ordername[i] = line.getIntByPosition(4);

or even shorter

ordername.add(line.getIntByPosition(4));

 

#CPLEXOptimizers
#DecisionOptimization

Originally posted by: Olivia.w

Hi, Daniel, 

 

 

Thank you very much for your detailed reply.  I think it will solve my problem.

I didn't notice that  IloIntArray(ordername.getEnv()) creates empty array. 

  ordername.add(line.getIntByPosition(4)) seems like what I want.

Thank you so much!!! 

 

#CPLEXOptimizers
#DecisionOptimization