Plotting 3D for three independent variables without any function

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Yaser Khojah
Yaser Khojah 2019-3-21
评论： M Naeem 2021-7-24
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
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Walter Roberson
Walter Roberson 2020-10-14
t = readtable('Surface plot.xlsx');
x = t.Temp; y= t.Pressure; z = t.Time;
tri = delaunay(x,y);
trimesh(tri, x, y, z);

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Walter Roberson
Walter Roberson 2019-3-21
编辑：Walter Roberson 2019-3-21
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.
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Yaser Khojah
Yaser Khojah 2019-3-21
Thank you so much, this is really useful. Is V presented by the colorbar? slic.png
Walter Roberson
Walter Roberson 2019-3-21
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.

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M Naeem
M Naeem 2021-7-23
can you please help in plotting graph of f(x,y,z)=2x+5xy+11xyz+2z
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Walter Roberson
Walter Roberson 2021-7-24
Ran in:
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

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