ui->customPlot->legend->setVisible(true);
  ui->customPlot->legend->setFont(QFont("Helvetica", 9));


  QPen pen;

    ui->customPlot->addGraph();
    pen.setColor(QColor(Qt::black));
    // generate data:
    int vec_size = GaussSeidl->PointHistory.size ();
    QVector<double> x(vec_size), y(vec_size);

    for (int k=0; k<vec_size; k++)
    {
      x[k] = GaussSeidl->PointHistory[k][0];
      y[k] = GaussSeidl->PointHistory[k][1];
      qDebug() << "Point History " << QString::number (GaussSeidl->PointHistory[k][0]) << " : "<< QString::number (GaussSeidl->PointHistory[k][1]);
    }
    ui->customPlot->graph()->setData(x, y);
    ui->customPlot->graph()->setPen(pen);
    ui->customPlot->graph()->setName(QCPScatterStyle::staticMetaObject.enumerator(QCPScatterStyle::staticMetaObject.indexOfEnumerator("ScatterShape")).valueToKey(QCPScatterStyle::ssDisc));
    ui->customPlot->graph()->setLineStyle(QCPGraph::lsNone);
    // set scatter style:
    ui->customPlot->graph()->setScatterStyle(QCPScatterStyle(QCPScatterStyle::ssDisc, 10));

  // make top right axes clones of bottom left axes:
  ui->customPlot->axisRect()->setupFullAxesBox();
  ui->customPlot->replot ();
}