QMap<int, int> rang_map_x;
rang_map_x.insert(2, 0);
rang_map_x.insert(9, 1);
rang_map_x.insert(7, 2);
rang_map_x.insert(5, 3);
rang_map_x.insert(1, 4);


    QList<int> invers_x, invers_y;
    invers_x = rang_map_x.values();
//  invers_y = rang_map_y.values();

    QVector<int> rang_x(5, 9), rang_y(timeseries.y.size());
//  for (int i=0; i<timeseries.x.size(); ++i)
    for (int i=0; i<5; ++i)
    {
        rang_x.insert( invers_x.at(i), i );
//      rang_y.append( invers_y.at( invers_y.at(i) ) );
    }

    //testweise ausgeben lassen
    QFile writeFile("blah.txt");
    writeFile.open(QIODevice::WriteOnly | QIODevice::Text);
    QTextStream out(&writeFile);
    out << "orig\tT-Index\tInvers\tRang" << endl;
    for (int i=0; i<5; ++i)
    {
        out << timeseries.x.at(i) << "\t" << i << "\t" << invers_x.at(i)  << "\t" << rang_x.at(i) << endl;
    }
    writeFile.close();