Slow plotting in App Designer

Question

Izan Segarra 2019-4-19

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/457463-slow-plotting-in-app-designer

回答： Eric Delgado 2022-9-20

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

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Answer 1

Eric Delgado 2022-9-20

0
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https://ww2.mathworks.cn/matlabcentral/answers/457463-slow-plotting-in-app-designer#answer_1057190

在 MATLAB Online 中打开

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