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

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Urayoan Ramos Santiago
评论： Asad (Mehrzad) Khoddam 2020-10-24
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.

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回答（1 个）

Asad (Mehrzad) Khoddam
Try to get 'Value' in the call back function:
handles.patient = get(hObject,'Value');
  2 个评论
Walter Roberson
Walter Roberson 2020-10-24
No, you need to get both the String and the Value, and use the Value to index the String.
Asad (Mehrzad) Khoddam
Asad (Mehrzad) Khoddam 2020-10-24
Yes, you are right. 'Value' propertiy gives the index to the selected item.

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