How can I record a section of a graphic user interface made with AppDesigner?

I'm trying to record a video of a dynamic graph that belongs in a graphic user interface, but I can't capture only the axes, meanwhile my code captures the whole interface.

This is the code I'm using:

plot (app. ZoomAX, Rs, resultplot, '.k');

axes=app. ZoomAX;

axes.Units = 'pixels';

pos=axes.Position;

marg = 30;

rect = [-marg,-marg, pos(3)+2*marg, pos(4)+2*marg];= getframe(axes,rect);

ax.Units='normalized';

writeVideo(v,F);

Also, how can I get pos value?

[Geoff Hayes]

@FRANCESCA SANASI - what is F? As you update the axes, you can use getframe to capture the axes as a frame. Something like

F = getframe(app.ZoomAX);

Also, I recommend not creating a variable named axes as that will conflict the built-in function of the same name (see axes).

[FRANCESCA SANASI]

@Geoff Hayes Thanks for the answer!

If I use my code it gives me this warning: "Specified rectangular area must be within the bound of the figurre's position property,. This argument will be ignored."

If I use

F = getframe(app.ZoomAX);

it says "Error using VideoWriter/writeVideo frame must be 305 by 132" and doesnt run.

How can I make it work?

[FRANCESCA SANASI]

F was the variable I used with getframe.

[Geoff Hayes]

@FRANCESCA SANASI - I think the error that you are seeing with respect to the frame size is because its size is changing from one iteration to the next and you cannot write differently sized frames to the video file. Is this the case?