void GUI::onCustom() {
    enableControls(false);
    m_CustomThread.matrix = AllocateMatrix<double>(CUSTOM_DEF, CUSTOM_DEF);
    m_CustomThread.size = CUSTOM_DEF;
    for (int i = 0; i < CUSTOM_DEF; ++i) {
        for (int j = 0; j < CUSTOM_DEF; ++j) {
            QTableWidgetItem *cur = ui.tblCustom->item(i, j);
            m_CustomThread.matrix[i][j] = cur->text().toDouble();
        }
    }

    m_CustomThread.start();
    FreeMatrix<double>(m_CustomThread.matrix);
}