My code is keep plotting the wrong data

1 vue (au cours des 30 derniers jours)
Peter
Peter le 7 Juil 2022
Commenté : Star Strider le 7 Juil 2022
I have a 9 coloumns by 150 rows matrix and I have chosen three coloumns from it to form my new 3 comloumns matrix, so I chose second to be my Z (hight) and 8 and 9 to be my x and y respectively.
M = TEST(:,[8;9;2])
surfl(M)
So, now I have a 3x150 Matrix and idealy it is 3 coloumns where first is X, second is Y and third is Z. Whenever I use surf. comand it plots wrong data and I am sure when I pick a plotted point it is all wrong. I do not know what to do to fix it.
and I do not want to plot a mathematical function I already have X Y and Z, and when I separate them, the code gives me an error that Z must be a matrix not vector, while it is obviously a matrix. I do not know how to solve it.

Réponse acceptée

Star Strider
Star Strider le 7 Juil 2022
Perhaps —
TEST = randn(150,9);
M = TEST(:,[8 9 2]);
x = M(:,1);
y = M(:,2);
z = M(:,3);
L = size(M,1);
xv = linspace(min(x), max(x), L);
yv = linspace(min(y), max(y), L);
[Xm,Ym] = ndgrid(xv, yv);
Zm = griddata(x,y,z,Xm,Ym);
figure
surf(Xm, Ym, Zm)
grid on
xlabel('X')
ylabel('Y')
zlabel('Z')
This should work with your data. It would help to have it to be certain.
.
  2 commentaires
Peter
Peter le 7 Juil 2022
It worked Thank you so much :)
Star Strider
Star Strider le 7 Juil 2022
My pleasure!
If my Answer helped you solve your problem, please Accept it!
.

Connectez-vous pour commenter.

Plus de réponses (1)

Jonas
Jonas le 7 Juil 2022
may the scatter3() command is suffiecient to visualize your data, you interpolate (e.g. interp3) your XYZ data to generate more points and use surf() after that

Produits

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by