Variables cannot be recognized in app designer

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Xiangfeng 2024-6-6

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https://ww2.mathworks.cn/matlabcentral/answers/2125901-variables-cannot-be-recognized-in-app-designer

回答： Kumar 2024-6-6

I wrote a program in a script and it works, but it doesn't work in app designer. The unrecognizable code is shown below (a part of the calling function). Thank you very much for your time.

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Answer 1

Matlab Pro 2024-6-6

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在 MATLAB Online 中打开

Hi @Xiangfeng

I've just tried it, It works 100% OK

Look @ the screenshot (attached)

What you must make sure is that you do have a "p_train" variable exiting in the "base" workspace

p_train = 'here is an answer for your question';

Anyhow (for future issues) - when you have an error - and you need some help - send the exact Error message

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Xiangfeng 2024-6-6

p_train and t_train are located in the objective function script. When I run the app to call the objective function, an error occurs (as shown in the figure below).

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Answer 2

Kumar 2024-6-6

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Hey!

To achieve this, you could turn the script into a MATLAB function that returns the variables as a function output. Then, you can call the function with the variables you need from, within app designer, and it will return the value to a variable you specify.

You can refer to this tutorial to get a basic understanding on how to convert a script into a MATLAB Function: https://www.mathworks.com/help/matlab/creating_guis/create-a-simple-app-or-gui-using-app-designer.html