Why is scatter slow to pan and zoom

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John Videtich 2017-3-24

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https://ww2.mathworks.cn/matlabcentral/answers/331756-why-is-scatter-slow-to-pan-and-zoom

评论： Matt J 2017-3-24

Hello, I'm using R2017 and am using numerous plot functions. I've just found that "scatter" seems to really limit how quickly I can navigate around on a plot. It doesn't seem to be my particular plot; it seems to be related to "scatter" only.

Example - compare panning a line plot and scatter plot (or zooming with the mouse wheel):

figure;
x = linspace(0,3*pi,200);
y = cos(x) + rand(1,200);  
scatter(x,y);
title( 'Scatter' );
pan on
figure;
x = 0:pi/100:2*pi;
y = sin(x);
plot(x,y);
title( 'Line' );
pan on
figure;
plot(x,y);
hold on
s = scatter(0,0,100,'>');
s.LineWidth = 2;
s = scatter(pi/2,1,100,'h');
s.LineWidth = 2;
s = scatter(pi,0,100,'+');
s.LineWidth = 2;
s = scatter(3*pi/2,-1,100,'^');
s.LineWidth = 2;
s = scatter(2*pi,0,100,'*');
s.LineWidth = 2;
title( 'Line & scatter' );
pan on

I'm only using scatter for 5-30 points, each with a different marker (new call to "scatter"). It gets progressively worse past 5 or 10 points. But it only takes 1 to significantly slow down pan/zoom update rates.

Any suggestions?

Thanks!

- John

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Matt J 2017-3-24

Hmmm. I'm not seeing any noticeably slow behavior. I would expect scatter to be slower on some time scale because you have more graphics objects in that plot, but it's not perceptible to me when manually panning/zooming.

A complete reboot of the computer might be something to try.

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