function varargout = update_gui(varargin)

persistent plot_handle plot_handle1
%create a run time object that can return the value of the outport block's
%input and then put the value in a string
rto1 = get_param('Beispiel4_sim/simout','RuntimeObject');


% create str from rto1
str = num2str(rto1.InputPort(1).Data);

% get a handle to the GUI's 'edit_display' window
display = findobj('Tag','edit_display');

% update the gui
set(display,'string',str);

% get Data from Simulation
XData = get_param('Beispiel4_sim','SimulationTime');
YData = rto1.InputPort(1).Data;


% save Data to workspace
assignin('base','XData',XData)
assignin('base','YData',YData)


% real-time plot

if isempty(plot_handle) || ~ishandle(plot_handle)
    guiplot=findobj(0, 'Tag','axesplot');
    plot_handle = plot(guiplot, XData, YData);
else
    XData_old = get(plot_handle, 'XData');
    YData_old = get(plot_handle, 'YData');
    XData = [XData_old, XData];
    YData = [YData_old, YData];
    set(plot_handle, 'XData', XData)
    set(plot_handle, 'YData', YData)
    %axis([0 20 0 10])
    drawnow
end