Change visibility of a frame with a push button

Hello! My task is to change the visibility of a frame with a push button. If the frame is visible, clicking the button should make it invisible and vice versa. Here is the code of the callback function for the pushbutton.

function pushbutton4_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton4 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

visibility = get(handles.uibuttongroup5, 'Visible') 
  if visibility == 'on'
set(handles.uibuttongroup5, 'Visible', 'off')
else
set(handles.uibuttongroup5, 'Visible', 'on')
end

And I am getting this error:

   Matrix dimensions must agree.

Error in guiassign>pushbutton4_Callback (line 346)
  if visibility == 'on'

Error in gui_mainfcn (line 95)
        feval(varargin{:});

Error in guiassign (line 42)
    gui_mainfcn(gui_State, varargin{:});

Error in
matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)guiassign('pushbutton4_Callback',hObject,eventdata,guidata(hObject)) 
Error while evaluating UIControl Callback.

>>

Can someone help me with that please?

Thank you!

Answer 1

[Stephen23]

You should use strcmpi to compare, not logical equivalence (which compares arrays element-wise):

if strcmpi(visibility,'on')

[Robert Eisenbecker]

Thank you very much, working now!!!