Illegal use of reserved keyword "global".

I recently migrated a code based on GUIDE to Appdesigner, ran it many times, but at some part I started receiving this error message in the first 'global' : Parse error at GLOBAL: usage might be invalid MATLAB syntax.

and at Command Window: Error using plugin_App

Error: File: plugin_App.mlapp Line: 208 Column: 17

Illegal use of reserved keyword "global".

             ...
                global val; %try to get the val from the slicer in the other button...
                global unif_image;
            
            unif_image(:,:,1) = dicom(:,:,(val-1));
            unif_image(:,:,2) = dicom(:,:,val);
            unif_image(:,:,3) = dicom(:,:,(val+1));
            
            std_dicom_image= std(single(unif_image),0,3); %standard deviation of the 3 images
            figure(3),
            imagesc(std_dicom_image)           %0 5000   %imshow(100*sqrt((std_dicom./mean_dicom).^2),'DisplayRange',[])
            title('std')
            
            mean_dicom_image= mean(single(unif_image),3); %average of 3 slices
            
            figure(4),
            imagesc(mean_dicom_image) %400 19000
            title('averaged images')
            ...
                

Can someone help me to fix this error? I can't compile my app until fix this

[Rik]

IS there a reason you're using global variables to share data between callbacks? Why aren't you using properties? Those are the equivalent of guidata fields in GUIDE.

For general advice and examples for how to create a GUI (and avoid using GUIDE), have look at this thread.

[Gustavo Lopes]

Thanks a lot, I was using global before (in GUIDE was working pretty well). I'm gonna change it for properties. :)

Answer 1

[Walter Roberson]

Notice the ... on the line above. You are using a continuation marker on a previous line so the global is not the first thing in the statement.