private void button2_Click(object sender, EventArgs e)
        {
            if (saveFileDialog1.ShowDialog() == System.Windows.Forms.DialogResult.OK)
            {
                String saveFile     = saveFileDialog1.FileName;
                int    numberOfEVec = (int)numericUpDown1.Value;

                PointSet p = _pca.GetPCAProjection(numberOfEVec);
                p.Save(saveFile);

                MessageBox.Show("File saved to\n" + saveFile);
            }
        }