Plotting in 3D from a table

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Soumyajit Samal
Soumyajit Samal 2021-7-13
回答： Chunru 2021-7-13
I am given a csv file with 3 columns. The first column is to be the X coordinate, 2nd as Y coordinate and 3rd column as Z coordinate. How can i make a surface plot of this.

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回答（2 个）

Siddharth Solanki
Siddharth Solanki 2021-7-13
You may use the readmatrix function for reading from the csv file and refer to this link for creating surface plots. This answer to a similar previous question might help.
Chunru
Chunru 2021-7-13
Ran in:
'doc griddata' for more details.
rng('default')
xy = -2.5 + 5*rand([200 2]);
x = xy(:,1);
y = xy(:,2);
v = x.*exp(-x.^2-y.^2);
% x, y, and v are vectors containing scattered (nonuniform) sample points and data.
% Define a regular grid and interpolate the scattered data over the grid.
[xq,yq] = meshgrid(-2:.2:2, -2:.2:2);
vq = griddata(x,y,v,xq,yq);
% Plot the gridded data as a mesh and the scattered data as dots.
mesh(xq,yq,vq)
hold on
plot3(x,y,v,'o')
xlim([-2.7 2.7])
ylim([-2.7 2.7])

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