Updating plot in loop takes increasing amount of time
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When I update a plot within a loop, each iteration takes longer after a while. Is there a way to avoid the slowdown? See example below:
f = figure;
a = axes(f);
hold(a,"on")
% note: y is supposed to represent real-time data that I receive with some
% frequency. The full vector Y is not available right before plotting
y = randn(1,100000);
for jj = 1:numel(y)
tt = tic;
plot(a,jj,y(jj),'pg');
drawnow;
pause(0.02)
toc(tt)
end
I understand the x and y arguments of the plot are getting larger. Is that the cause? After 6,000 iterations, it already takes three times as long as when the loop it started. Thank you
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Matt J
2022-5-5
编辑:Matt J
2022-5-5
I understand the x and y arguments of the plot are getting larger. Is that the cause?
The arguments aren't getting larger, but the number of objects in the plot is getting larger and larger. You can reduce the overall time, though, if the graph doesn't need to be redrawn as frequently.
Maybe update in sub-chunks of y:
f = figure;
a = axes(f);
hold(a,"on")
y = randn(1,100000);
for jj = reshape( 1:numel(y),1000,[]) %<--- loop over sub-chunks of length 1000
tt = tic;
plot(a,jj,y(jj),'pg');
drawnow;
pause(0.02)
toc(tt)
end
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