How to plot 3D surface with the given points in excel

2022 3 11
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更新时间：2022 3 14
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Hello,
Does anybody know h ow can we plot 3D surface for points in 3 columns as a vector? I have 3 different 20 by 1 vectors and I want to get 3D plot. Two first are input and next output.
Thanks

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KSSV
KSSV 2022-3-11

1 个投票

T = readtable(myexcelfile) ;
x = T.(1) ; y = T.(2) ; z = T.(3) ;
%%structured
xi = unique(x) ; yi = unique(y) ;
[X,Y] = meshgrid(xi,yi) ;
Z = reshape(z,size(X)) ;
figure
surf(X,Y,Z)
%%unstructured
dt = delaunayTriangulation(x,y) ;
tri = dt.ConnectivityList ;
figure
trisurf(tri,x,y,z)

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Torkan
Torkan 2022-3-11
编辑：Torkan 2022-3-11
Thank you so much. Actually I put x , y, and z in matlab itself as a 8 by 1 vector for each. The code that gives 3 by 3 matrix and it gives error as
Error using reshape
Number of elements must not change. Use [] as one of the size inputs to automatically calculate the appropriate size for that dimension.
x = [0.333;
0.333;
0.2727;
0.2727;
0.2727;
0.2;
0.2;
0.2];
y= [525;
550;
500;
525;
550;
500;
525;
550];
z = [866.178;
866.178;
877.209;
877.209;
877.209;
885.272;
885.272;
885.272
];
Torkan
Torkan 2022-3-11
The second code works actually but I do not know the difference
KSSV
KSSV 2022-3-11
I have commented in the code. First one is structured grid and second one is unstructured grid.
Torkan
Torkan 2022-3-11
Yes yes I see. However, what does that mean exactly? this means for my data we cant construct structured one or...?
KSSV
KSSV 2022-3-11
x0 = min(x) ; x1 = max(x) ;
y0 = min(y) ; y1 = max(y) ;
[X,Y] = meshgrid(linspace(x0,x1,10),linspace(y0,y1,10)) ;
Z = griddata(x,y,z,X,Y) ;
surf(X,Y,Z)
Torkan
Torkan 2022-3-14
I used also this one to make it smooth
f = fit([x y],z,"poly23");
plot(f,[x y],z);
But the issue is for some of the data the vertical axis range is too high? Would you please check it and let me know what can I do?
x = [0.333;
0.333;
0.333;
0.2727;
0.2727;
0.2727;
0.2;
0.2;
0.2];
y= [525;
550;
500;
500;
525;
550;
500;
525;
550];
z1= [-74.6;
-21.788;
-125.444;
-124.603;
-71.143;
-17.073;
-107.754;
-52.662;
2.7513];
f = fit([x y],z,"poly23");
plot(f,[x y],z);
c = jet(20);
colormap(c);
shading interp
By the way in matlab 2022 this function does not wok

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