Plotting 3D data

Dear Matlab comunity, I struggle to solve seemingly a simple problem.

I have a 54x3 matrix which I would like to plot, such that first coloumn represents x-axis, second coloumn represents y-axis and third coloumn represents a value assigned to [x,y] points.

However, when I use surf(Error_matrix), what I get is a surface scaled such that x-axis goes from 1 to 3 (as number of coloumns), y-axis goes from 0 to 54 (as number of rows) and z gives some weird combination.

In other words, I have a 6x9 checker board with an value assigned to each intersection (representing an error) and I would like to plot an error value to each of the intersections. Please find the error_matrix attached.

Can you please help me out?

Answer 1

[KSSV]

load('Error_matrix.mat')
x = Error_matrix(:,1) ; 
y = Error_matrix(:,2) ; 
z = Error_matrix(:,3) ; 

xi = unique(x) ;  nx = length(xi) ;
yi = unique(y) ;  ny = length(yi) ;

[X,Y] = meshgrid(xi,yi);
Z= reshape(z,ny,nx) ;

surf(X,Y,Z)

[Adam Rajcan]

Exactly, thank you so much! Could you please also write a short explanation of what went wrong? Or forward me to some tutorial, where I can get to understand the issue?

[KSSV]

You have a m*3 data.....for this you cannot use surf unless you arrange them into a matrices X, Y and Z.