Function within function not running in app

Question

Keshav 2023-12-7

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https://ww2.mathworks.cn/matlabcentral/answers/2057634-function-within-function-not-running-in-app

回答： SANKALP DEV 2023-12-22

I've got a button on the app which should call the run_start function. Within run_start it should call another function from an if/else statement.

Using the app, the if/else statement is skipped entirely. dMhelium would normally be assigned a value from another function called within the if/else statement.

If I call run_start manually from command window then everything works as intended.

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Answer 1

SANKALP DEV 2023-12-22

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Hello Keshav,

I understand that you are encountering an issue when attempting to invoke a function from a button's callback in the App Designer.

The error message "Output element Dihelium (and possibly others) not assigned during call to 'run_start' function", suggests that within your “run_start” function, there is an expected output variable (in this case, Dihelium) that has not been assigned a value before the function attempts to return it.

Here is a sample code on how to set up a button callback in App Designer to call the “run_start” function with the necessary arguments:

function StartButtonPushed(app, event) 
    % Retrieve values from UI components 
    xPosition = app.Xpositionspinner.Value; 
    altitude = app.altitudespinner.Value; 
    % Call the run_start function with the retrieved values and additional arguments 
    dMhelium = run_start(xPosition, altitude, -14, -15); 
    % Now dMhelium contains the result from run_start function 
    % You can use dMhelium as needed within your app
end