what does this error mean? Error while evaluating UIControl Callback.

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Razan Al shabah
Razan Al shabah 2022-12-28
回答： Image Analyst 2022-12-28
this is my code:
% --- Executes on button press in gray_scale.
function gray_scale_Callback(hObject, eventdata, handles)
% hObject handle to gray_scale (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
a= getappdata(0,'a');
a_gray= im2gray(a);
setappdata(0, 'filename', a_gray);
axes(handles.axes3);
imshow(a_gray)

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回答（1 个）

Image Analyst
Image Analyst 2022-12-28
It means that when you click on the button called gray_scale, there was an error. You didn't give the entire error message (ALL the red text) but just a snippet of it so we don't know what really went wrong. But possibly there was no (badly named) a in the appdata workspace. Are you sure you loaded it in before then? Or it could be that a exists but it is not an RGB image.
Attach your .fig and .m file if you need more help.

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