"SWITCH expression must be a scalar or a character vector".

Hello. I am trying to use a SWITCH statement that uploads a specific ECG data based on the selected string of a Pop-Up menu. This data should then be visualized in the Axes Box of the GUI. When I start running the GUI, the initial data is uploaded without any problems, but once I choose another string from the Pop-Up menu, it displays the error "SWITCH expression must be a scalar or a character vector." How do I fix this? I have uploaded photos of the Opening Function, plot function, and Pop-Up menu callback functions so you can better visualize the problem.

Answer 1

[Asad (Mehrzad) Khoddam]

Try to get 'Value' in the call back function:

handles.patient = get(hObject,'Value');

[Walter Roberson]

No, you need to get both the String and the Value, and use the Value to index the String.

[Asad (Mehrzad) Khoddam]

Yes, you are right. 'Value' propertiy gives the index to the selected item.