How to plot an array of 4 columns?

Hello,

I have an array of four columns: X,Y,Z,A.

I need to visualize this data.

I tried surf3 and plot3 but it seems that the data I have is not in the right format for this function.

I suspect A is going to be a color, but I am not sure how to do it

Thanks

[Stephen23]

Is the data gridded or scattered?

[Torsten]

Use "slice"

https://uk.mathworks.com/help/matlab/ref/slice.html

after you made them gridded.

Answer 1

[Star Strider]

I wrote this to solve a similar problem. The original problem was to create a surf plot to match a scatter plot.

Try this —

N1 = 100;
x = randn(N1,1);
y = randn(N1,1);
z = randn(N1,1);
c = 10*rand(size(z));

figure
stem3(x, y, z)
hold on
scatter3(x, y, z, 100, c, 'filled')
hold off
CL = clim;
colormap(turbo)
xlabel('X')
ylabel('Y')
zlabel('Z')

Zfcn = scatteredInterpolant(x, y, z, 'natural','none');
Cfcn = scatteredInterpolant(x, y, c, 'natural','none');

N = 150;
xv = linspace(min(x), max(x), N);
yv = linspace(min(y), max(y), N);
[Xm,Ym] = ndgrid(xv, yv);

Zm = Zfcn(Xm, Ym);
Cm = Cfcn(Xm, Ym);

figure
surfc(Xm, Ym, Zm, Cm, 'EdgeColor','interp')
clim(CL)
colormap(turbo)
xlabel('X')
ylabel('Y')
zlabel('Z')

The apparently random colours match in both.

.

[Pierre]

great, thank you, will try

[Star Strider]

My pleasure!

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