problem with nested function in GUIDE

I have got following set of code - It is basically functioning based on the plot data obtained previously. Main function gets all the data and creates a popupmenu. Nested function help me get histogram for each plot individually.

    function pushbuttonhistogram_Callback(hObject, eventdata, handles)
    % hObject    handle to pushbuttonhistogram (see GCBO)
    % eventdata  reserved - to be defined in a future version of MATLAB
    % handles    structure with handles and user data (see GUIDATA)

    global filelist;
    global subitems_plot;
    global subsubitems_plot;
    item_index = get(handles.listboxitems, 'Value');
    items_list = cellstr(get(handles.listboxitems, 'String'));
    item = items_list{item_index};
    subitem_index = get(handles.listboxsubitems, 'Value');
    subitems_list = cellstr(get(handles.listboxsubitems, 'String'));
    subitem = subitems_list{subitem_index};
    subsubitem_index = get(handles.listboxsubsubitems, 'Value');
    subsubitems_list = cellstr(get(handles.listboxsubsubitems, 'String'));
    subsubitem = subsubitems_list{subsubitem_index};
    f = figure('Name','Histogram Plot','NumberTitle','off');
    figure(f);
    len = length(filelist);
    ax = axes('Parent',f,'position',[0.13 0.28  0.77 0.54]);
    uicontrol('Parent',f,'Style','popupmenu', 'String', filelist, 'Position',[81,54,419,23], 'Callback', @fileselect);

    function fileselect(source,event)
            val = source.Value;
    if isempty(subsubitems_plot)
        hist(ax, subitems_plot(:, val));
        title(ax, {item;subitem});
    else
        hist(ax, subsubitems_plot);
        title(ax, {item;subitem;subsubitem});
    end
    end

Problem: Not getting any kind of plot. If I add end after nested functioin am getting error -

Illegal use of reserved keyword "end".

and without 'end' nested function does not connect with main function.

[Ameer Hamza]

Although not an answer to your question, you can create a separate function file and place it in MATLAB path instead of creating nested function. Another solution is to simply place it as a normal function inside m file of the GUIDE. But it depends on your application, whether a nested function is necessary or not.

[Stephen23]

@Ghenji: also note that you should use guidata rather than global variables:

https://www.mathworks.com/help/matlab/creating_guis/share-data-among-callbacks.html

Answer 1

[Jan]

The required format is clear: The main functions and nested function must be closed by an "end":

function main
  function nested1
  end
end

function sub1
end

It seems like there is a missing end anywhere in your code outside the posted part. Please control this by an auto-indentation: Ctrl-A Ctrl-I . Does the last line of the file end in the first column?

[Ghenji]

Thank you Jan. Seems like putting end at right place was the only problem after all. All sorted now.