How i can plot result in my GUI ?

[FelixB]

your code can't work. why do you clear the points-vector in each loop? I already gave you the solution how to fix that...

remember:

QPolygonF polygon;
for(unsigned int i=0; i<10; i++)
polygon << function();
 
curve->setSamples(polygon);

QPolygonF polygon;
for(unsigned int i=0; i<10; i++)
polygon << function();
 
curve->setSamples(polygon);

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and you don't need to call "myplot->show()" in plotValuesFromFunction, it's sufficient to do that once in the constructor.

PS: you already opened one thread for this topic. it's very bad style to create a second thread only because nobody answers in your first thread.