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

2011 6 8
2 个回答
4 次查看（30 天）

0 个投票

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
Andrew Newell 2011-6-8

0 个投票

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.

11 个评论
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pink
pink 2011-6-8
sorry andrew,
Error in ==>
main>undeformedbutton_Callback at 653
line
(AX(i,:),AZ(i,:),AY(i,:),'-g.','LineWidth',1);
Andrew Newell
Andrew Newell 2011-6-8
line(AX(i,:),AZ(i,:),AY(i,:),'LineStyle','-','Color','g','Marker','.','LineWidth',1)
pink
pink 2011-6-8
??? Index exceeds matrix dimensions.
Andrew Newell
Andrew Newell 2011-6-9
Are you saying that this error only occurs when you use line instead of plot3? Are you changing anything else besides the plot commands?
Walter Roberson
Walter Roberson 2011-6-9
size(AX)
size(AZ)
size(AY)
size(AXD)
size(AZD)
size(AYD)
pink
pink 2011-6-9
AX =[ 0 2.1213;
4.2426 2.1213;
4.2426 2.1213;
0 2.1213]
AY =[ 0 4000;
0 4000;
0 4000;
0 4000]
AZ =[-4.2426 -2.1213;
-4.2426 -2.1213;
0 -2.1213;
0 -2.1213]
AXD =[ 0 2.0900;
4.2426 2.0900;
4.2426 2.0900;
0 2.0900]
AYD =[ 0 3.6818;
0 3.6818;
0 3.6818;
0 3.6818]
AZD =[4.2426 2.1849;
4.2426 2.1849;
0 2.1849;
0 2.1849]
pink
pink 2011-6-9
hi andrew
error occurred, if I change the "plot3"to "line"
pink
pink 2011-6-9
is work
sorry, but the picture does not fit what I want
pink
pink 2011-6-9
object generated using the "plot3" not the same as using the "line"

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Walter Roberson
Walter Roberson 2011-6-8

0 个投票

You only need to execute the "hold on" once; after that it is set and becomes a waste of time.
At some point, you are going to exceed the amount of memory that your graphics card has easily available; things will slow down then.
You could experiment with switching renderers.

6 个评论
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pink
pink 2011-6-8
hi, Walter
Can you give an example?
Walter Roberson
Walter Roberson 2011-6-8
set(gcf,'Renderer','zbuffer')
pink
pink 2011-6-8
Calling AXES(h) without an output be can slow. Include 'h' in plot fucntion argument
Walter Roberson
Walter Roberson 2011-6-9
Yes, that could help:
axh = gca;
plot3(axh, AX(1,:),AZ(1,:),AY(1,:),'-c','LineWidth',0.25);
hold(axh,'on')
plot3(axh,AXD(1,:),AZD(1,:),AYD(1,:),'-g','LineWidth',0.5);
for i = 2:length(AX,2)
plot3(axh,AX(i,:),AZ(i,:),AY(i,:),'-c','LineWidth',0.25);
plot3(axh,AXD(i,:),AZD(i,:),AYD(i,:),'-g','LineWidth',0.5);
end
Walter Roberson
Walter Roberson 2011-6-9
Should be size(AX,1) instead of length(AX,2)
pink
pink 2011-6-9
AX =[ 0 2.1213;
4.2426 2.1213;
4.2426 2.1213;
0 2.1213]
AY =[ 0 4000;
0 4000;
0 4000;
0 4000]
AZ =[-4.2426 -2.1213;
-4.2426 -2.1213;
0 -2.1213;
0 -2.1213]
AXD =[ 0 2.0900;
4.2426 2.0900;
4.2426 2.0900;
0 2.0900]
AYD =[ 0 3.6818;
0 3.6818;
0 3.6818;
0 3.6818]
AZD =[4.2426 2.1849;
4.2426 2.1849;
0 2.1849;
0 2.1849]

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pink
pink
2011-6-8

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