App Slow With UIAxes
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Ephraim Bryski on 4 Aug 2020
Commented: Joel Berkson on 24 May 2023 at 21:41
Hi. I'm creating apps on app designer which use components such as sliders to control a plot. When plotting on a UIAxes, there is significant delay. However, when having the app plot on a separate figure, there is no delay. Does anyone know the reason for this and if there's a way to plot on the UIAxes without the delay? Thanks.
I'm going to use an app modelling a cylinder removing a lot of the additional unnecessary stuff, so the type of problem is as clear as possible. The plot consists of surf, patch, and plot3. For all apps, the goal is not plotting data per say, but rather creating shapes, often in 3 dimensions. Therefore, the data is generally arrays of type double which don't generally get over 100 elements.
I'm using MATLAB R2020a.
These are the two methods:
- I drag and drop a UIAxes on to the app and plot on that axis. This takes about 3 seconds to update the plot each time I move the slider. This is a screenshot of the setup:
- I create a separate regular figure (not uifigure) and plot it on that. This has almost no delay:
This is the code used to create the separate figure and have them aligned neatly (I don't think it's that important but it clarifies what I'm doing):
global ax %needed so it can be accessed through component callbacks
divide=.2;%the fraction of the screen filled by the app
fig=figure; %new figure
ax=axes(fig); %axis it will be plotted on
Here is the code which I used (I removed much of the code used in the original app to simplify things) (the code is based off of Clay M. Thompson's cylinder function, and I kept the copyright text in the code):
% Clay M. Thompson 4-24-91, CBM 8-21-92.
% Copyright 1984-2002 The MathWorks, Inc.
% engineering equations:
% set up cylinder:
n = 50;
r = [r r]';
r = r(:); % Make sure r is a vector.
m = length(r); if m==1, r = [r;r]; m = 2; end
theta = (0:n)/n*2*pi;
sintheta = sin(theta); sintheta(n+1) = 0;
x = r * cos(theta);
y = r * sintheta;
z = (0:m-1)'/(m-1) *L* ones(1,n+1);
% plot cylinder
patch(ax,x(1,:),y(1,:),z(1,:),[.25 0 .7])
patch(ax,x(1,:),y(1,:),z(2,:),[.25 0 .7])
% plot circles
J. Alex Lee on 25 Mar 2021
thanks @Adam Danz, I think I actually confused everyone with my above posted...the way I separated was to create the figures once and for all, and then keep deleting and creating axes inside them - so the plot I showed only reflects axes creation time, and the conclusion from that should not be "ime is really spent by the uifigure call", but rather that creating uiaxes and axes alike within an existing uifigure is slower than creating them within an existing regular figure.
And the second time test I did shows that actually, plotting might be faster within uiaxes than in regular axes once they are created, whether it be within a uifigure or a regular figure. but either way, plotting is still much faster on uiaxes or axes created in a normal figure.
Chris Portal on 7 Aug 2020
Thank you @Adam Danz and @Ephraim Bryski. The additional info is useful. I see the same uifigure/uiaxes slowness Adam is showing.
Ephraim, try using a uifigure/axes combination instead. This shows similar performance results to the figure/axes combination:
- UIFIGURE/UIAXES: Elapsed time is 1.871439 seconds.
- UIFIGURE/AXES: Elapsed time is 0.205658 seconds.
- FIGURE/AXES: Elapsed time is 0.204895 seconds.
A few notes:
- UIAXES is a heavier weight version of AXES (it's effectively an axes with an invisible UI panel). This makes it slower, although the amount of slowness here is a little surprising. I'll report this to the development team to investigate.
- The axes you get in App Designer when you drag and drop from the palette is always a UIAXES. So in order to use an AXES with your UIFIGURE, you'll need to manually create and position it as part of your startup function.
- Lastly, these UIAXES/AXES differences will soon become a much simpler story with some up and coming work. Keep an eye out for the MATLAB release notes!
More Answers (2)
Matlab User on 21 Mar 2021
Edited: Matlab User on 21 Mar 2021
I just installed Matlab R2021a and this is still not resolved - the jaw dropping UIAxis lag is still there. Maybe it was a mistake to fork Guide into a new thing...
@Chris Portal It seems no-one can reproduce your solution. Are you sure that you did not simply time FIGURE/AXES twice? Could you please share your code if it works for you.
I'm using some code like below (not full):
ax_id = app.UIAxes;
an = animatedline(ax_id, 'MaximumNumPoints',1000);
addpoints(an, x(i), y(i));
if (rem(i,100) == 0)
xlim (ax_id, [i-1000+1 i]);
xlim (ax_id, [1 i]);
Here are some timings:
- No plotting: 60s
- Standard Figure + axes: 63s
- UIaxes only: 84s
I hope this will be resolved in the future - many many threads with complaints, but nothing has been done.
Veronica Taurino on 2 May 2022
Are there any speed-improvements in Matlab 2021b? If so, I still struggle to find it by myself
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