Why is plot3 slow when I use it in a loop?

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pink 2011-6-8

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/9062-why-is-plot3-slow-when-i-use-it-in-a-loop

I create plot3 in gui axes, if the number of elements that the many depictions of the process is very slow, if you can provide solutions

for i=1:length(AX(:,1))
   plot3(AX(i,:),AZ(i,:),AY(i,:),'-c','LineWidth',0.25);
   hold on
   plot3(AXD(i,:),AZD(i,:),AYD(i,:),'-g','LineWidth',0.5); 
end

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回答（2 个）

Andrew Newell 2011-6-8

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https://ww2.mathworks.cn/matlabcentral/answers/9062-why-is-plot3-slow-when-i-use-it-in-a-loop#answer_12490

在 MATLAB Online 中打开

You could try using line instead of plot3. You'll have to make sure all your options come in pairs, e.g.,

line(AX(i,:),AZ(i,:),AY(i,:),'LineStyle','-','Color','c','LineWidth',0.25);

See linespec for how to define each property.

EDIT: With the data you provided, I tried these commands and it worked fine.

for i=1:size(AX,2)
  line(AX(i,:),AZ(i,:),AY(i,:),'LineStyle','-', ...
'Color','c','Marker','.','LineWidth',1)
  line(AXD(i,:),AZD(i,:),AYD(i,:),'LineStyle','-', ...
'Color','g','Marker','.','LineWidth',1)
end

On my machine this is 4 times faster than using the code you provided. Note that when you use line the image is saved by default, so you don't need hold on.