How do I use plot command in GUI?

I have a small problem which kept me busy for two days already. In my project I want to display a signal from Simulink in realtime in a Matlab GUI using event listeners. Therefore, I created a GUI using GUIDE with one axes on it. To update the graph, I created a function, which receives the data from Simulink. So far, everything works fine. When I try to use plot(), the graph just doesn't show up. If I use stem() insted, it works. If I open a figure outside the GUI, plot() is working. Somehow, the GUI doesn't like the plot(). Anybody has an idea how to solve this?

   %Data from Simulink to plot
sim_data1 = data1.InputPort(1).Data;
sim_data2 = data2.InputPort(1).Data;

 %scroll the graph to show only recent data  
n=50;
if sim_time <n
    xlim([0, 1500]);
else
    xlim([sim_time-50 sim_time+1450]);
end

   %plot the graph
plot(sim_time,sim_data1); %<- not worikng
stem(sim_time,sim_data1); %<- working
hold on;

Thank you very much for your help!

Thomas

Answer 1

[Geoff Hayes]

Thomas - since you are plotting individual points, try changing the line width to make the point appear larger

 plot(sim_time,sim_data1,'LineWidth',5)

or plot a shape at the point (much like the stem call does)

 plot(sim_time,sim_data1,'o')

Do either of the above increase the visibility of the data points?

[Thomas]

Thank you for your reply. Both solutions didn't work. I've found another way by adding

global ph1; 
ph1 = line([0],[0],'LineWidth',2,'Color','b');

to the GUI OpeningFcn function and adding this

global ph1;
xData1 = get(ph1,'XData'); 
yData1 = get(ph1,'YData');
xData1 = [xData1 sim_time]; 
yData1 = [yData1 sim_data1];
set(ph1,'XData',xData1,'YData',yData1);
drawnow;

to the update function. Thank you!