matlab plot3如果z不是F（x，y）的函数

Question

X and Y are matrix of 1*50000, I have already use plot(X,Y).

Z is the distance, it is a 1*30 matrix, it represents different x,y data at different length, and Z is independent of F(x,y).

For example, at Z=1 there is a graph of X,Y at Z=1.7 there is another pair of X,Y, etc

so how can I tell matlab to do is, because in plot3 Z is a function of F(x,y)

thanks!

Answer 1

If I understood your question correctly you can use meshgrid to generate to required data. See my simple example below:

X = [1 2 3 4 5];
Y = [3 2 1 9 5];
Z = [1 1.5 2];
[x,z] = meshgrid(X,Z);
[y,~] = meshgrid(Y,Z);
plot3(x',y','z')

Answer 2

If you want to plot a set of points (X,Y) for each element of Z, this is pretty straightforward. You just need to copy the element of Z for each point in (X,Y)

Z = 1:30;

figure; 
hold on;

% I'm only plotting the first two elements of Z for simplicity
% Change the length of the for loop to plot them all 
for ii=1:2
    % I randomly initialize (X,Y) for demonstration purposes, 
    % but you would probably load them from somewhere else.
    X = rand(1 ,500);
    Y = rand(1, 500);

    scatter3(X, Y, reshape(repmat(Z(ii), 500, 1), 1, []));
    % You could also use plot3   
    % Rotate the resulting figure to see both layers
end

If you can also concatenate your (X,Y) sets for efficiency,

% In your code, X1, X2, and Y1, Y2 should correspond to the (X,Y) pairs 
% for the first two elements of Z   
X = [X1; X2];
Y = [Y1; Y2];
Z = 1:2;
scatter3(X(:), Y(:), reshape(repmat(Z, 1, 500), 1000, []));