MATLAB: Plot in real time inside a loop

loopplotting

I'm reading data from ADC in real time (while loop) and I'm trying to plot in real time. Now, I can't use 
pause on; hold on; etc
Because it interferes with ADS's API and how it samples the data. My code looks something like that and it does plot in real time.
while 1 %sampling from ADC

    %figure(1); if I uncomment just this line, API crashes
    plot(x, datafromADC)
    drawnow;   
end
But if I want to plot to two different figures at the same time, I can't do it, ADC stops sampling and gives me criptic errors. I try to do something like that:
while 1 %sampling from ADC
    figure(1);
    plot(datafromADC);
    drawnow;
        if cond == 1
            figure(2);
            plot(datafromADC*2);
            dranow;
        end
end
Is there another way to plot to two different figures inside the loop? Should I use something else instead of 'dranow'?
I'm using DATAQ DI-1110 and its MATLAB API.

Best Answer

fig1 = figure(1);
ax1 = axes('Parent', fig1);
ph1 = plot(ax1, nan, nan);
fig2 = figure(2);
ax2 = axes('Parent', fig2);
ph2 = plot(ax2, nan, nan);
while true
    update data at this point
    set(ph1, 'XData', x, 'YData', datafromADC);
    set(ph2, 'XData', x, 'YData', datafromADC*2);
    drawnow limit;
end
Related Question