The code where I set the data to the cruve is :
Qt Code: 
  1. liste_courbe->append(curve);
  2.  
  3.  
  4. myPlot = new QwtPlot("XXXXX",this);
  5. mainLayout->addWidget(myPlot);
  6. this->setLayout(mainLayout);
  7.  
  8.  
  9.  
  10.  
  11. for(int k=0; k<nbParam; k++)
  12. {
  13. 	QList<QByteArray> liste_SL2;
  14. 	QList<QByteArray> liste_val;
  15.  
  16. 	....
  17.  
  18. 	nbValeur = liste_SL2.size()-1;
  19.  
  20. 	QVector<double> x;
  21. 	QVector<double> y;
  22.  
  23. 	for (int i=0; i<nbValeur; i++)
  24. 	{
  25. 		double newX = liste_SL2.at(i).toDouble();
  26. 		double newY = liste_val.at(i).toDouble();
  27.  
  28. 		if(x.contains(newX))
  29. 		{
  30. 			if(!y.contains(newY))
  31. 			{
  32. 				x.append(newX);
  33. 				y.append(newY);
  34. 			}
  35. 		}
  36. 		else
  37. 		{
  38. 			x.append(newX);
  39. 			y.append(newY);
  40. 		}
  41.  
  42. 		liste_courbe->at(k)->setData(x.data(), y.date(), x.size());
  43.  
  44. 		liste_courbe->at(k)->attach(myPlot);
  45.  
  46. }
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btw: this forum has a subforum especially for qwt, I suggest to put your qwt-related questions there next time
Ok sorry, I'll post to the subforum next