Failing in creating a surface from three array

I am trying to create a surface from this dataset

x=[0.5 ; 0.624; 0.75;0.874; 0.9;1;1.124]
y=[0; 1.1;1; 0.9;0.6;0]
z=[0.726582;  0.629144;    0.714131;   0.499709;  0.668832;   0.664573]

I am using this code found in here

xi = unique(x) ; yi = unique(y) ;
[X,Y] = meshgrid(xi,yi) ;
Z = reshape(z,size(X)) ;
figure
surf(X,Y,Z)

but I get this error

"Error using reshape

Number of elements must not change. Use [] as one of the size inputs to automatically calculate the appropriate size for that

dimension.

Error in untitled2 (line 8)

Z = reshape(z,size(X)) ;"

I cannot understand what I am doing wrong.

Answer 1

[Star Strider]

Use one of the interpolation functions (here griddata) to create the ‘Z’ matrix —

x=[0.5 ; 0.624; 0.75;0.874; 0.9;1.124];
y=[0; 1.1;1; 0.9;0.6;0];
z=[0.726582;  0.629144;    0.714131;   0.499709;  0.668832;   0.664573];

N = 10;
xv = linspace(min(x), max(x), N);
yv = linspace(min(y), max(y), N);
[X,Y] = ndgrid(xv, yv);
Z = griddata(x, y, z, X, Y);

figure
surfc(X, Y, Z)
grid on
xlabel('X')
ylabel('Y')
zlabel('Z')
view(70,30)

.

Answer 2

[Torsten]

To create a surface, you need a z value for each combination of (x/y) values. Thus instead of a vector z with 6 elements you need a matrix of size (7x6).

[SYML2nd]

Can you show me how to obtain a matrix (7x6)? Do you mean (6x7) by doing Z=[Z,Z,Z,Z,Z,Z,Z] (I tried but it doesnt work)

[Torsten]

x=[0.5 ; 0.624; 0.75;0.874; 0.9;1;1.124];
y=[0; 1.1;1; 0.9;0.6;0];
z=[0.726582;  0.629144;    0.714131;   0.499709;  0.668832;   0.664573];
[X,Y] = meshgrid(x,y);
Z = repmat(z,1,7);
surf(X,Y,Z)

But the surface plot only makes sense if you really have a function f with z(i,j) = f(x(i),y(j))