How do I mix a GUI with a code?

Hello, I have designed a GUI for my project, and I have a separate code. I need help integrating them together. The GUI is designed in a way where it asks for a driving frequency, and the code should begin running to gather the data after entering a driving frequency. I have the GUI, and the code separately. I am not sure how I can mix them together though. I am new to MATLAB, so I am incredibly lost in that sense. I would appreciate any help. Thank you very much!

[Stephen23]

"I am not sure how I can mix them together though."

Inside your GUI you can import the data (from file/s), process it by calling whatever functions you want (including your own), and then finally save the output data (to file). That is the very general answer to your very general question.

Don't panic. Take it one step at a time, for example where does the data come from? Inside your GUI you can add the functions that import your data, just like you would from inside any other function.

https://www.mathworks.com/matlabcentral/answers/228557-experts-of-matlab-how-did-you-learn-any-advice-for-beginner-intermediate-users

I recommend writing your own GUI following Rik's well-written advice given here:

https://www.mathworks.com/matlabcentral/answers/483657-how-to-create-a-gui#answer_394878

Otherwise you can use the AppDesigner (which makes it simple at the beginning):

https://www.mathworks.com/products/matlab/app-designer.html