2D array data plot!

[Uwe]

I'd like to draw 2d array data and it is my first experience with QWT, everything is OK, but the following code is drawing only ONE(last) curve.

Not surprising, because in your code is only one curve. The second setData call changes the points of the curve, but doesn't create a second one.

Instead you need to attach 2 different QwtPlotCurve objects - one for each array.

Uwe