How to do surface plot from given set of data?

I have X and Y and Z coordinates. Now i want ro do surface plot of these data, I used surf() command but its showing error. can anyone give idea how can i plot the data. I have add data for the reference.

[Mahmoud Ashraf]

Z must be a matrix

[Mahmoud Ashraf]

if the values x,y,and z is a coordinates of point i think we shoud use 3d plot instead of surface or used this line

load Data.txt     % after we remove the chararcter from the txt file
surf(data);

Answer 1

[KSSV]

T = readtable('data.txt') ;
x = T.(1) ;
y = T.(2) ;
z = T.(3) ;
% Plot as unstructured grid 
dt = delaunayTriangulation(x,y) ; 
p = dt.Points ;
tri = dt.ConnectivityList ; 
F = scatteredInterpolant(x,y,z) ;
z = F(p(:,1),p(:,2)) ; 
figure(1)
trisurf(tri,p(:,1),p(:,2),z)
view(2)
shading interp 
% Plot as structured grid
xi = linspace(min(x),max(x),300) ; 
yi = linspace(min(y),max(y),300) ; 
[X,Y] = meshgrid(xi,yi) ; 
Z = griddata(x,y,z,X,Y) ;
figure(2)
pcolor(X,Y,Z) ;
shading interp 

[Prakash Chettri]

There is a error in 'z' values while computing 'z' size of z i m getting is 291x1 but the size of 'x' and 'y' are 341z1. To plot all value should be of same size.

error is like this

Error using griddata (line 106)

X and Y must be same length as Z or the lengths of X and Y must match

the size of Z.

[KSSV]

I am not getting any error.....Show us the code you have tried.

I think you have copied the given answer and tried. It has over written the variable z. Use the below code:

T = readtable('data.txt') ;
x = T.(1) ;
y = T.(2) ;
z = T.(3) ;

xi = linspace(min(x),max(x),300) ; 
yi = linspace(min(y),max(y),300) ; 
[X,Y] = meshgrid(xi,yi) ; 
Z = griddata(x,y,z,X,Y) ;

pcolor(X,Y,Z) ;
shading interp 

[Prakash Chettri]

I just copied the above code and just do change in load data. other i kept as it is but showing error but the second code works fine.

Thank you for the help.

[KSSV]

Thanks is accepting/ voting the answer.