Plotting subplot in real time Problem

I am interfacing Arduino with MATLAB through serial plot. I have an accelerometer that input three values each time into the serial plot. I am trying to plot the 3 channel data into 3 separate subplot in real time. For some reason, only my last subplot will continuous scroll and the first two will stay at one scroll window.

if(scrollWidth > 0)
          set(plotgraph1,'XData',time(time > time(count)-scrollWidth),...
              'YData',datax(time > time(count)-scrollWidth));
          xlim([time(count)-scrollWidth time(count)]);
          set(plotGraph2,'XData',time(time > time(count)-scrollWidth),...
              'YData',datay(time > time(count)-scrollWidth));
          xlim([time(count)-scrollWidth time(count)]);
          set(plotGraph3,'XData',time(time > time(count)-scrollWidth),...
              'YData',dataz(time > time(count)-scrollWidth));
          xlim([time(count)-scrollWidth time(count)]); 
end

Answer 1

[Jan]

xlim([time(count)-scrollWidth time(count)])

This updates the X-limits of the current axes. If you only set the XData of an existing line object (created by a plot command), the current axes does not change. Therefore define the affected axes explicitely:

xlimit = [time(count)-scrollWidth, time(count)];
set(axes1, 'xlim', xlimit);

and the same for the other two axes also - assuming that axes1 is defined accordingly. You can set all three axes with one command also:

set([axes1, axes2, axes3], 'xlim', xlimit);

[Lok Yiu To]

Thank you so much!!! :)

[Lok Yiu To]

One follow-up question:

if I want to overlay two signals in one plot, do I just do the following?

set(plotgraph1,'XData',time(time > time(count)-scrollWidth),...
            'YData',datax(time > time(count)-scrollWidth),...
            'XData',time(time > time(count)-scrollWidth),...
            'YData',datay(time > time(count)-scrollWidth));

Thank you :)

[Jan]

No, this will not work. But you can create two line objects in the same axes:

AxesH = axes('NextPlot', 'add');
plot1graph = plot(AxesH, ?, ?);
plot2graph = plot(AxesH, ?, ?);

And later:

set(plotgraph1,'XData',time(time > time(count)-scrollWidth),...
          'YData',datax(time > time(count)-scrollWidth));
set(plotgraph2, 'XData',time(time > time(count)-scrollWidth),...
          'YData',datay(time > time(count)-scrollWidth));

[OMARI TAHAR]

Thank you so much!!! :)