surf plot from data sets connected to each other

Question

Karolina 2022-9-3

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1793860-surf-plot-from-data-sets-connected-to-each-other

评论： Karolina 2022-9-8

data.mat

I have a data (the file "data.mat" in attachment), that has a connected ribbons „structure”. I want to make a meshgrid and then a surface plot from the data, in a "circle way" seen on the picture below. When I tried to do this, I got an error informing that I am trying to use memory resources equivalent to billions of data.

Here is the code, I did for plotting using plot3() function.

data1=flip(data);

r=data1{:,'Yposition'};

t=data1{:,'Angle'};

z=data1{:,'MagZ'};

x=(2*pi*t)/360;

%first element of the vector

p=r(length(r),1)-2;

%last element of the vector

o=r(1,1);

%the number of radii

N=((o-p)/2)+1;

%amount of data for one circumference

k=floor(length(r)/N);

%plotting loop

figure

hold on

grid on

for i=1:(N-1);

j=(((i-1)*(k))+1):((i)*(k));

plot3((i)*cos(x(j)),(i)*sin(x(j)),z(j))

end

I ask You for help, because I have spent days on solving the problem and still don't know how to do this. :(

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Answer 1

Chunru 2022-9-3

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1793860-surf-plot-from-data-sets-connected-to-each-other#answer_1041010

在 MATLAB Online 中打开

load(websave("data.mat", "https://www.mathworks.com/matlabcentral/answers/uploaded_files/1115735/data.mat"))

head(data)

ans = 8×3 table

Yposition Zposition Angle _________ _________ ______ 128 80 232.51 128 80 232.45 128 80 232.67 128 80 232.54 128 80 232.38 128 80 232.47 128 80 232.49 128 80 232.49

data1=flip(data);

r=data1.Yposition;

t=data1.Angle;

z=data1.Zposition;

x = r.*cosd(t);

y = r.*sind(t);

DT = delaunay(x, y);

Warning: Duplicate data points have been detected and removed.
Some point indices will not be referenced by the triangulation.

trisurf(DT,x,y,z,r, 'EdgeColor', 'none')

view(3)