thanks for the help, i change my array w/ a Qvector<qvector<qlineEdit>> array but i still cant figure out how to use qDeleteAll() to remove the created widgets and add a new ones...

Qt Code: 
  1. void MatrixOP::createGridMatrixValues(int size)
  2. {  
  3.     setMatrixValues = new QGroupBox (tr("Input Values"));
  4.     QGridLayout *layout = new QGridLayout;
  5.     qDebug()<<size;
  6.     for(int j=1; j<=size+1;j++){
  7.         QVector<QLineEdit *> foo;
  8.         for (int i=1; i<=size+1;i++){
  9.             QLineEdit *value =new QLineEdit(this);
  10.             foo.append(value);
  11.             layout->addWidget(value, j, i);
  12.         }
  13.         vectorOfVectorOfLineEdits.append(foo);
  14.     }
  15.  
  16.     setMatrixValues->setLayout(layout);
  17. }
  18. void MatrixOP::on_changeIndex_chooseSize(int index)
  19. {
  20.     vectorOfVectorOfLineEdits.clear();
  21.     createGridMatrixValues(index);
  22. }
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