GUI takes input and push button calls m file then will display the result in GUI

Hello Matlab community,

I have this GUI and CRC8.m. Now I can call the crc8 inside the push button. But, the input shall be from the Numeric field edit and the result from the crc8 shall be displayed in Text field edit. How I suppose to do that in Appdesigner?

[Adam Danz]

This is a very basic task in App Designer.

I suggest going through some tutorials to learn the basics if you plan on developing an app using app designer.

1. https://www.mathworks.com/help/matlab/app-designer.html
2. https://www.mathworks.com/help/matlab/creating_guis/create-a-simple-app-or-gui-using-app-designer.html
3. https://www.mathworks.com/help/matlab/creating_guis/write-callbacks-for-gui-in-app-designer.html

[Hafizuddin Bin Mohd Lowhim]

I have gone through but none of them has a specific example that I need. This is my first time in Appdesigner.

[Adam Danz]

I added a 3rd tutorial.

Tutorials 2 & 3 in the list above show you how to define and use callback functions. That's what you need to learn, it seems.

Of course there isn't going to be a tutorial that exactly solves your problem. The idea is to learn how to use app designer and then apply that knowledge to your app. Otherwise, volunteers would just be doing your work for you.

For example, once you're in the PushButton callback function, it's very easy to access the values from any app component. It's also straightforward how to assign a value to a component. Those are the two steps you're missing and they are both covered in the tutorials.

If you have a specific question we can surely help you out.

[Hafizuddin Bin Mohd Lowhim]

Yes 2 questions since the tutorial doesn't cover the m file. Most people discuss how to do it in guide but not in appdesigner.

1. How to pass the value from Numeric Field edit to m file as input?
2. How my m file knows it should receive input from Numeric Field edit?

[Adam Danz]

The function should be written within AppDesgiern unless the function in your m-file is being used by other functions and scripts outside of AppDesiger.

Re #1) Assuming the function must be external to the app, within an m-file, you can pass any variable you want from app designer in the same way you would pass a variable to any function. To access the value of an app component, follow the example under "Using Callback Function Input Arguments" in the 3rd tutorial I listed.

Re #2) Not sure what you mean here. The value you pass will be an input to the function in your m-file.

Tutorial on creating functions:

https://www.mathworks.com/help/matlab/matlab_prog/create-functions-in-files.html