How can I update a plot on GUI ?

Question

Synchro_mdn 2018-8-26

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评论： Image Analyst 2018-8-26

Hi everyone.

I was trying to modify the plot of my GUI. The problem is : I plot a sine wave plot (T, Y), where T=to:1/(20*f):tf; And all value are given by an user through the GUI and executed by a Run button. Then, the user should be able to use a slider to modify the T (at Real Time) axes by

>xinput=set(handle.slider,'value')
>T=to:1/(xinput*f):tf;

Then plot it again on the GUI.

Thanks.

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Synchro_mdn 2018-8-26

Yes, I did. I hadn't tried it yet. The dorwnow go at the end of the code, right?

Image Analyst 2018-8-26

It can go whenever you think you want to repaint/refresh the screen. Otherwise it will refresh only when it thinks it's not too busy. Usually when you're in a fast loop you want to put the drawnow inside the loop or else it might not repaint the screen until all the iterations have finished. If it works, can you Accept the answer below?

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Answer 1

Image Analyst 2018-8-26

2
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在 MATLAB Online 中打开

It should work. If it's not, then add this line:

drawnow;

after your plotting code. But it sounds like you want the graph to update both when you click the Run button and when you move the slider. In that case, have each control's callback function call a function called GraphCurve() or something like that. Then GraphCurve would look something like:

function handles = GraphCurve(handles)
sliderValue = handles.slider1.Value % Get value from slider control.
Y = .... some function of T and sliderValue.
plot(T, Y, 'b*-', 'LineWidth', 2);
grid on;
xlabel('T', 'FontSize', 20);
ylabel('Y', 'FontSize', 20);
title('Y vs. T', 'FontSize', 20);
drawnow;