Surface plot problem with mesh

2014 4 10
3 个回答
回答已采纳
更新时间：2014 4 12
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0 个投票

Hello, I've got a code that solves pde system. As a result I've got matrix with values in different points (coordinate and time layer). Now I'm trying to plot the surface like this
figure
[x1,y1]=meshgrid(time,x);
surf(x1,y1,u(:,:),'EdgeColor','black');
colormap(copper)
set(gca,'linewidth',2)
shading interp;
grid on;
hold on;
where x and time are vectors of coordinate and time points, u is the result matrix. But the surface looks very strange.
How can I add the lines on this surface? Like this

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 采纳的回答

Mischa Kim
Mischa Kim 2014-4-10

0 个投票

Danila, remove
shading interp;

6 个评论
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Mischa Kim
Mischa Kim 2014-4-10
编辑：Mischa Kim 2014-4-10
Very interesting. Could you attach your data ( x,time,u ) as a .mat file? Also, for better readability, please add comments as comments, not answers.
Danila Zharenkov
Danila Zharenkov 2014-4-10
Here is my .m file with code. x and time are the vectors of grid points for PDE solution.
Mischa Kim
Mischa Kim 2014-4-10
It's the huge number of data points that make the surface mesh lines turn the entire plot black. You can see the effect when reducing m and tmax.
So what you should be able to do, is to plot on top of your original plot an extra surface mesh (using the hold command) with a reduced number of data points.
Danila Zharenkov
Danila Zharenkov 2014-4-10
You are right, with reduced number of data points it works.
Do you mean that I should solve this system second time with reduced number of points and plot it on the first surface?
Mischa Kim
Mischa Kim 2014-4-11
编辑：Mischa Kim 2014-4-11
Or simply down-sample the matrices. Would this work:
figure;
[x1,y1] = meshgrid(time,x);
xsam = 1:5:size(x1,1); % the 5 sets the lines spacing
ysam = 1:3000:size(x1,2);
surf(x1(xsam,ysam),y1(xsam,ysam),u(xsam,ysam),'EdgeColor','black');
colormap(copper);
You still got all the data (for analysis), for visualization the down-sampled plot should be sufficient.

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更多回答（2 个）

Danila Zharenkov
Danila Zharenkov 2014-4-10

0 个投票

I was trying to remove shading. Here's the result
It's funny, I can't understand what going on with this plot.
Kelly Kearney
Kelly Kearney 2014-4-10

0 个投票

The wireframe function will give the effect you're looking for:
[x,y,z] = peaks(500);
surf(x,y,z);
shading flat;
wireframe(x,y,z,20);

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