Why is my surface not fitting the data points smoothly?

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Nicholas 2015-1-13

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评论： Nicholas 2015-1-13

Hi,

I have a set of 125 (x,y,z) data points that are supposed to represent smooth planes. I am trying to calculate the curvature on these planes but the surfaces are not fitting the data points smoothly (please see below). I don't know why this is happening and if anyone could provide advice that would be much fantastic.

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Nicholas 2015-1-13

No I don't have any NaNs in the data set - is it possible that there aren't enough points?

Star Strider 2015-1-13

If you have 125 data triplets, and none of them are NaN, you should have enough points to define your surface. I would use scatter3 or stem3 (that I prefer because it tells me where the x and y coordinates for a particular z are located) to see what your data look like with it. It could give you some insight into the problem.

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Answer 1

Alessandro Masullo 2015-1-13

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https://ww2.mathworks.cn/matlabcentral/answers/169802-why-is-my-surface-not-fitting-the-data-points-smoothly#answer_164776

在 MATLAB Online 中打开

You can try to plot your surface with trisurf:

     [x,y]=meshgrid(1:15,1:15);
     tri = delaunay(x,y);
     z = peaks(15);
     trisurf(tri,x,y,z)

Can your problem be related to the points order?

There's also a Matlab bug related with the plot of surfaces. Try to execute opengl software, close all your windows and try again.

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Nicholas 2015-1-13

I think the points order is probably influencing this as if I change the shape of the arrays, a different surface appears. I have no clue as to why reshaping the arrays would be doing this though

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