Slow plotting in App Designer

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Izan Segarra
Izan Segarra on 19 Apr 2019
Answered: Eric Delgado on 20 Sep 2022
Hello! I am measuring signals in real time and I need to represent the signal in a graph. When I use datetick, the graph becomes very slow.
Is there any way to represent the real time signal in a efficient way?
h1 = animatedline(app.UIAxes,nan,nan,'Color','b','LineWidth',1.5);
app.UIAxes.YGrid = 'on';
startTime = datetime('now');
while ~app.stopLoop
serialRead = fscanf(arduino,'%d');
voltage = serialRead*(1100/1023);
y = bandpass(app,voltage);
t = datetime('now') - startTime;
% Add actual measurement
addpoints(h1,datenum(t),y);
% Update Axis
app.UIAxes.XLim = datenum([t-seconds(15) t]);
datetick(app.UIAxes,'x','keeplimits')
drawnow limitrate
end

Answers (1)

Eric Delgado
Eric Delgado on 20 Sep 2022
Yeah. The interactivity in this new universe of uifigure is still too slow. The simple solution is to use de old Matlab figure. Don't forget to create properties in your app to handle the figure and the axes.
You could do something like this...
% Declare two new properties of your app.
properties (Access = public)
fig = [];
ax = [];
% Create a function and call it during the startup of the app.
function startup_figCreation(app)
app.fig = figure;
app.ax = axes(app.fig);
end

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