Communication Toolbox function in App designer

Hi Everyone,

I created an app for users enter values that will allow them to run communication toolbox functions in matlab app designer. However, my issue is that the object image that pops up when the impulse response is generated, dissappears. How to ensure the object image is still?

Thank you,

Tyler Seudath

Answer 1

[Hornett]

Ensuring that an object image remains visible after generating an impulse response in a MATLAB App Designer application involves a few considerations around how graphics are handled and updated within the app. Here are some steps and best practices to help you troubleshoot and solve the issue of the disappearing object image:

1. Use a Dedicated UIAxes Component

Make sure you are plotting the impulse response inside a dedicated UIAxes component that is not being inadvertently cleared or reused for other plotting actions. If you dynamically generate plots, it’s crucial to target the correct UIAxes.

plot(app.UIAxes, x, y); % Ensure 'app.UIAxes' is the intended axes for the impulse response plot 

2. Manage Visibility and Plot Updating

If the plot disappears due to the app updating or changing views, ensure the visibility of the UIAxes or the container holding it is managed properly. Also, when updating the plot, use hold on to retain the current plot when adding new plots.

% To hold onto the current plot

hold(app.UIAxes, 'on');

plot(app.UIAxes, newX, newY); % Plotting new data without removing the old
hold(app.UIAxes, 'off'); % Release to allow future plot clearances3. Check for Automatic Clearing Mechanisms

Your app might have logic that automatically clears plots under certain conditions (e.g., when new data is entered). Check your code for any cla(app.UIAxes) or clf(app.UIAxes) calls that might be executing unexpectedly and remove or condition them appropriately.

3. Debugging Display Issues

Use debugging techniques to ensure that the code segment responsible for displaying the impulse response is executed as expected. Breakpoints or disp statements can help you verify the execution flow and identify any conditions leading to the disappearance of the plot.

4. Review UI Component Layering

In App Designer, UI components are layered based on the order they are created. Ensure that the UIAxes or the plot is not being inadvertently covered by another UI component. You might need to adjust the UIAxes position or the StackOrder property of overlapping components.

By following these steps, you should be able to ensure that the object image generated by the impulse response remains visible in your MATLAB App Designer application.