How to do surface plot from given set of data?

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Prakash Chettri
Prakash Chettri 2022-3-31
评论： KSSV 2022-3-31
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.
  2 个评论
Mahmoud Ashraf
Mahmoud Ashraf 2022-3-31
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);

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KSSV
KSSV 2022-3-31
编辑：KSSV 2022-3-31
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
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Prakash Chettri
Prakash Chettri 2022-3-31
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.

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