While loop not working in MATLAB app designer callback function

Hello there,

I making a simple app that reads numerical data inputed by the user and outputs arrays of data as result of some formula. In one of the callback functions, I have a while loop which, after the conditions is fulfilled, gives an array as a result. The function works correctly in the editor but in the app designer, it fails to recognise all the variables that are in the while loop.

Can anyone suggest what would be the possible reason behind this?

Thanks

Answer 1

[Jon]

You probably have a scoping issue. Shared values are typically stored variable names such as app.myVariable

To give any more specific help you would need to provide the code you are using and the detailed error messages that you are receiving

[Shivam Dubey]

hey Jon, thanks for getting back. I have attached the code now. Also, below is the code in the callback in the app designer looks and error message:

--

% All inputs from the user

K_FAW = app.CoilStiffness1NmmEditField.Value;

W_FAW = app.UnladenloadperwheelkgEditField.Value;

MR_FAW = app.Motionratio1EditField.Value;

BST_FAW = app.UnladentoBStouchtravel1mmEditField.Value; %unladen to bump stop touch travel

WCC_FAW = app.InitialwheelcentrecoordinateEditField.Value; % inital wheel centre position

[WT_FAW,Total_BSLoad_FAW,Total_Load_FAW] = WheelTravelFAW(K_FAW,W_FAW,MR_FAW,BST_FAW);

-----

Error message:

Error using WheelTravelFAW

Too many input arguments.

Error in NewTemplate/CreateSpringingDataButtonPushed (line 121)

[WT_FAW,Total_BSLoad_FAW,Total_Load_FAW] = WheelTravelFAW(K_FAW,W_FAW,MR_FAW,BST_FAW,4000,9.81);

Error using matlab.ui.control.internal.controller.ComponentController/executeUserCallback (line 386)

Error while evaluating Button PrivateButtonPushedFcn.

[Jon]

Callback functions in the app designer must alway have app and event as their first two arguments

[Jon]

Actually I think these are the only arguments that the app designer callbacks can have. If you want to pass any data to them then put it into the app properties so you can access it inside of the callback function. Note in the appdesigner code view you can add properties using the property tab in the code browser (on the left side of the screen)

[Shivam Dubey]

Hi, sorry if this wasn't clear earlier. But this isn't a callback function. The function that I shared is within a button pushed callback function in the app. Below is a screenshot of the callback function.

[Jon]

Where is this function call made (I cut an pasted this from your error message above)?

Error in NewTemplate/CreateSpringingDataButtonPushed (line 121)

[WT_FAW,Total_BSLoad_FAW,Total_Load_FAW] = WheelTravelFAW(K_FAW,W_FAW,MR_FAW,BST_FAW,4000,9.81);

Note that it has 6 input arguments and your definition of WheelTravelFAW only has 4 input arguments. This is what is giving you the error. You need to find out where this call is coming from and fix it. From the error message. It looks like it comes from a function call CreateSpringingDataButtonPushed

[Shivam Dubey]

Please ignore that I have already corrected that but it still fails to recognise y_FAW basically the outcome of the while loop.

[Jon]

If you need more help please post the full error message you are now getting and even better attach enough code to reproduce the problem