3d surf plot question

Question

Darin McCoy 2011-12-1

I have a matrix

Matrix(1:10,1) = 1;
Matrix(1:10,2) = 1:10;
Matrix(11:20,1) = 2;
Matrix(11:20,2) = 1:10;
Matrix(1:20,3) = rand(20,1);

I would like to make a surface plot of this matrix and do

surf(Matrix(:,1),Matrix(:,2),Matrix(:3))

But it doesn't let me because it expects matrix (instead of vector) inputs. So i tried several meshgrid implementations

[X Y] = meshgrid(Matrix(:,1),Matrix(:,2));
Z = meshgrid(Matrix(:,3));
surf(X,Y,Z)

but they don't quite give me what i want. (which is a plot of all the values in 3d). Any ideas?

Answer 1

Walter Roberson 2011-12-1

scatter3(Matrix(:,1), Matrix(:,2), Matrix(:,3))

You cannot do a surface plot unless you have a 2D grid of z values.

Answer 2

the cyclist 2011-12-1

Did you instead have something like this in mind?

>> plot3(Matrix(:,1),Matrix(:,2),Matrix(:,3),'.')