How to plot a 2d matrix on a 3d graph?

Question

Lucas Carvalho 2015-3-20

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https://ww2.mathworks.cn/matlabcentral/answers/184254-how-to-plot-a-2d-matrix-on-a-3d-graph

评论： Lucas Carvalho 2015-3-20

Hi guys, I want to plot in 3d a matrix whose columns represent points in the space:

A = [x0 x1 x2 .... xn; y0 y1 y2 .... yn; z0 z1 z2 .... zn]

So the first point is [x0;y0;z0], the second one [x1;y1;z1], until the last n-th point. My intention is to create a trajectory between these points. I have already tried surf, mesh and other 3d plots, but none of them are doing it.

Thank you!

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Answer 1

Konstantinos Sofos 2015-3-20

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在 MATLAB Online 中打开

Hi,

So the problem is that you do not want to plot a matrix but the information contained in 3 vectors (which are the columns of a matrix) in 3D. Have you tried griddata?

As an example

X=rand(1,30);
Y=rand(1,30);
Z=rand(1,30);
[XI YI ZI] = griddata(X,Y,Z,linspace(0,1),linspace(0,1)');
surf(XI,YI,ZI)

Regards

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Lucas Carvalho 2015-3-20

在 MATLAB Online 中打开

Thank you for the suggestion Konstantinos, but I've figured out another way. My example is below with the graph:

 W  = @(e,omega,t,a,b,c)[e*cos(omega*t) - sin(omega*t).*(a - b*t);
       e*sin(omega*t) + cos(omega*t).*(a - b*t);
       c+4*t];
e = 50;   
omega = 10;
t = 1:0.01:10;
a = 20;
b = 5;
c = 2;  
 W_f   = W(e,omega,t,a,b,c);
 for i=1:(numel(W_f(1,:))-1)
    p1 = W_f(:,i)';
    p2 = W_f(:,i+1)';
    pts = [p1;p2];
    grid;
    plot3(pts(:,1),pts(:,2),pts(:,3))
    hold all
    i=i+1;
 end