Plotting 3D for three independent variables without any function

23 vues (au cours des 30 derniers jours)
Yaser Khojah
Yaser Khojah le 21 Mar 2019
Commenté : M Naeem le 24 Juil 2021
I have four vectors as attached in Data_1.tx. file. I'm looking for a way to plot their surface map. Where X = (:,column3), Y = (:,column 2) and Z = (:,Column 1). I have looked into meshgrid but did not work since I do not have a function to estimate Z from given X and Y Values. They are only data. I have found and tried this below code but did not like the graph.
trisurf(delaunay(X,Y),X,Y,Z)
I have tried Scatter 3 as below and I do not like it. Is there anyway to present them as the below colourful box? Thank you for your help. scatter.png
  5 commentaires
Walter Roberson
Walter Roberson le 14 Oct 2020
t = readtable('Surface plot.xlsx');
x = t.Temp; y= t.Pressure; z = t.Time;
tri = delaunay(x,y);
trimesh(tri, x, y, z);
Amanullah Khan
Amanullah Khan le 19 Oct 2020
Thank you so much Mr Walter. It worked for me.

Connectez-vous pour commenter.

Réponse acceptée

Walter Roberson
Walter Roberson le 21 Mar 2019
Modifié(e) : Walter Roberson le 21 Mar 2019
For a typical surface map, you would use
interpolated_z = griddata(X, Y, Z, query_x, query_y);
surf(query_x, query_y, interpolated_z, 'edgecolor', 'none')
However, the example diagram you give is an example of using https://www.mathworks.com/help/matlab/ref/slice.html on a 3D grid of data. You do not have the information necessary for that -- not unless the unused 4th column of your input is value information.
When I look at your data, it looks to me to be more likely that your first column is value information and that your remaining three columns are X, Y, Z coordinates, rather than your first column being Z coordinates.
  6 commentaires
Yaser Khojah
Yaser Khojah le 21 Mar 2019
Thank you so much, this is really useful. Is V presented by the colorbar? slic.png
Walter Roberson
Walter Roberson le 21 Mar 2019
Yes, V is represented as color.
You can also create a diagonal set of query points, and hold on and slice() with it. When I looked at the data I could not see any particular angle that it would make sense to slice at.

Connectez-vous pour commenter.

Plus de réponses (1)

M Naeem
M Naeem le 23 Juil 2021
can you please help in plotting graph of f(x,y,z)=2x+5xy+11xyz+2z
  2 commentaires
Walter Roberson
Walter Roberson le 24 Juil 2021
N = 50;
xvec = linspace(-5,5,N);
yvec = linspace(-5,5,N);
zvec = linspace(-5,5,N);
[X,Y,Z] = meshgrid(xvec, yvec, zvec);
fxyz = 2 .* X + 5 .* X .* Y + 11 .* X .* Y .* Z + 2 .* Z;
minf = min(fxyz(:));
maxf = max(fxyz(:));
levels = linspace(minf, maxf, 9);
levels = levels(2:end-1);
nlev = length(levels);
for K = 1:nlev
L = levels(K);
isosurface(X, Y, Z, fxyz, L, fxyz);;
end
camlight; lighting phong
legend( string(levels) );
colorbar
hold off
M Naeem
M Naeem le 24 Juil 2021
Thank you soo much ...

Connectez-vous pour commenter.

Catégories

En savoir plus sur Data Distribution Plots dans Help Center et File Exchange

Tags

Community Treasure Hunt

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

Start Hunting!

Translated by