I need to plot a surface plot from given X and Y coordinate matrixes and z as a constant value.

My matrices are X= [0 1;2 3]; and Y = [0,1; 2 3]; Now I need to plot each value of X with every value of y with a z value of 0 i.e. x=0, y=0,z=0 ; x=0,y=1,z=0; x=0,y=2,z=0; x=1,y=0,z=0;and so on. How do I do this?

Answer 1

[Guillaume]

Why do your X and Y have two columns if it means nothing?

X = 0:3;
Y = 0:3;
Z = 0;
[XX, YY] = ndgrid(X, Y);
surf(XX, YY, repmat(Z, size(XX)));

[Basu Parmar]

That is because in my original intended case, X and Y are part of output, with random values, not 0:3.

[Walter Roberson]

Instead of repmat you can use

surf(XX, YY, Z * ones(size(XX)))

[Basu Parmar]

Thank you very much. That works perfectly.