Creating a GUI for an ECG arrhythmia classifier

Hello, I am working on an arrhythmia classifier using matlab. The work is almost done and now I think it will look more presentable if I am able to develop a GUI where I can give the input ECG recording and it will display the accuracy and the confusion matrix. I saw the documentation as to how to build a simple GUI. But how can I link my code for feature extraction and classification to the GUI?