Hi April,
You can use the hold command as you usually would to plot multiple graphs on an axes. You will need to call hold with the axes as an input. Say I had an axes in my app called UIAxes, then the code for overlaying a line and bar graph could look like the following:
y = [75 91 105 123.5 131 150 179 203 226 249 281.5];
bar(app.UIAxes,y);
hold(app.UIAxes);
plot(app.UIAxes,y,'*');
