Plot3 with different colors depending on the value of Z

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patr chri 2020-6-19

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https://ww2.mathworks.cn/matlabcentral/answers/551344-plot3-with-different-colors-depending-on-the-value-of-z

评论： patr chri 2020-6-19

I am trying to create something like a contour plot but only with vectors. To be more specific, I have 3 vectors of equal lengths and I am using plot3 to visualize their data. Now I am trying to add colors depending on the Z value. I have written the following code, but it doesn't work and I don't know why:

max_iter = find(n_iter(2:end)==0);
MAX = n_iter(max_iter);
MAXVAL = optValues(max_iter);
color = ['b','g','y','r'];
for i = 1:length(MAXVAL)
    if(MAXVAL(i) < 1)
        plot3(1:1:i,MAX(i),MAXVAL(i),color(1)); hold on;
    elseif (MAXVAL(i) < 50)
        plot3(1:1:i,MAX(i),MAXVAL(i),color(2));hold on;
    elseif (MAXVAL(i) < 400)
        plot3(1:1:i,MAX(i),MAXVAL(i),color(3));hold on;
    else
        plot3(1:1:i,MAX(i),MAXVAL(i),color(4));hold on;
    end
end
grid on;
xlabel('Simulation time steps');ylabel('Iteration');zlabel('Objective Function Value'); 

By "it doesn't work" I mean that MATLAB is busy without producing any results.

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采纳的回答

KSSV 2020-6-19

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/551344-plot3-with-different-colors-depending-on-the-value-of-z#answer_454339

在 MATLAB Online 中打开

Let (x,y,z) be your m*3 data. Two options:

If data is structured

x = unique(x) ; nx = length(x) ; 
y = unique(y) ; ny = length(y) ; 
[X,Y] = meshgrid(x,y) ;
Z = reshape(z,nx,ny) ; 
contour(X,Y,Z) ;

If data is unstructured:

m = 100 ; n = 100 ; 
xi = linspace(min(x),max(x),m) ; 
yi = linspace(min(y),max(y),n) ; 
[X,Y] = meshgrid(xi,yi) ; 
Z = griddata(x,y,z,X,Y) ;
contour(X,Y,Z)