Matlab App Designer Listbox Index

Matlab’s App Designer’s listbox lacks some of functionality of GUIDE’s listbox.

App Designer’s listbox currently offers no direct method to obtain the index number of a selected item.

Here is a roundabout method for a sample listbox named listbox_type:

Items = char(app.listbox_type.Items);
im=app.listbox_type.Value;
[n]=find_index(Items,im)

% n is the index of the selected item

function[n]=find_index(Items,im)
im=strtrim(im);
n=1;
sz=size(Items);

for i=1:sz(1)
           sss=strtrim(Items(i,:));
           if(strcmp(im,sss))
                n=i;
            break;
end    

There is probably a more streamline way of doing this though.

Update. Here is a better way from: https://chat.openai.com/

Items = strtrim(app.ListBox.Items);
im = strtrim(app.ListBox.Value);
n = find(strcmp(Items, im))

– Tom Irvine