My data is x,y,z,w. How can I create a 3D contour plot of it?

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Ewen Chan 2017-6-28

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评论： Yuli Han 2019-12-9

DOE sweep1B.txt

I have a tab delimited text file (see attached) that has x,y,z data from a design of experiments sweep and the output variable is w.

I tried using this:

fidi=fopen('DOE sweep1A.txt', 'rt'); % version of text file without headers
D=textscan(fidi, %f%f%f%f');
X=D{1}; % rpm
Y=D{2}; % m_dot
Z=D(3); % P
W=D{4); % Power
N=100;
Xi=linspace(min(X),max(X),N);
Yi=linspace(min(Y),max(Y),N);
Zi=linspace(min(Z),max(Z),N);
[Gx,Gy,Gz]=meshgrid(Xi,Yi,Zi);
Wi=griddata(X, Y, Z, W, Gx, Gy, Gz, 'natural');
contour(Gx, Gy, Gz, Wi, 'Linestyle', '-', 'Linecolor', [0 0 0], 'ShowText', 'on', 'LevelStep', 1)
grid on
colormap(jet)
colorbar;

And I know that it doesn't work because it can only have 2 dimensions and also that there are repeating numbers for X, Y, and Z because it is a design of experiments sweep.

But I would still want to plot this preferably in a 3D contour plot.

Is there a way to do so?

Thanks.

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KSSV 2017-6-29

Yours is a volumetric data, not a surface data. What you expect?

Ewen Chan 2017-6-29

I didn't expect anything from it.

I was just recycling an old solution that I got from here and tried to use it for a new problem.

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回答（2 个）

Walter Roberson 2017-6-29

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You might want to experiment with isosurface(). You might want to ask it to draw at several different surface levels

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Walter Roberson 2017-6-29

We can't say, as you have not defined your desired output in any useful way. What would you expect a "3d contour plot" to look like? Do you have an example plot?

Walter Roberson 2019-8-7

Perhaps https://www.mathworks.com/matlabcentral/fileexchange/38858-contour-plot-for-scattered-data

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John Mickett 2019-8-6

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It is a good question. He wants to do output of surf.m with three coords but instead of colored contours wants lines. Not a hard concept.

surf(X,Y,Z,C) but instead of C you have contour intervals.

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Yuli Han 2019-12-7

Hi John,

I have a similar problem recently. The figure you showed above is right what I need. Could you please share the code or tell more detail about how to draw it? Much appreciated.

Yuli Han 2019-12-9