I am trying to plot a signal and use a scrollbar on the x-axis to view several hours worth of data

 I would like to be able to use the uicontrol to update the figure as I scroll with the timestamp information on the x-axis. Also, I would like to be able to access the data as it is updated in order to generate a linked spectorgram of the data in a separate plot beneath the signal. This would allow me to scroll through the time-stamped data and view the spectogram of the data as I scroll through. So far I have only been able to create a scrollbar that allows me to scroll through my data with a specified window size in seconds on the x-axis. Besides adding the time-stamps I still need to access the data in the plot as it is updated by moving the scrollbar. The uicontrol handle is empty for some reason and I can not access the data currently displayed in the time window. Below is the function I have created so far.

function [] = SlidingWindowPlot(Signal,Fs,WindowSize)

a=gca;

t=0:1/Fs:(length(Signal)-1)/Fs;

p=plot(t,Signal);

set(gcf, 'windowstyle', 'docked', 'color' ,'w'); set(gcf,'doublebuffer','on'); grid on

set(a,'xlim',[0 WindowSize]); set(a,'ylim',[-5 5]);

pos=get(a,'position'); Newpos=[pos(1) pos(2)-0.1 pos(3) 0.05];

tmax=max(t); S=['set(gca,''xlim'',get(gcbo,''value'')+[0 ' num2str(WindowSize) '])'];

h=uicontrol('style','slider',... 'units','normalized','position',Newpos,... 'callback',S,'min',0,'max',tmax-WindowSize);

Answer 1

[Frantz Bouchereau]

Hi Nicholas, have you tried the Signal Analyzer app? It allows you to visualize long signals and pan through them in the time and frequency domain. See more here: https://www.mathworks.com/help/signal/ug/getting-started-with-signal-analyzer-app.html

Thanks Frantz