Plotting 3D for three independent variables without any function

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Yaser Khojah 2019-3-21

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评论： M Naeem 2021-7-24

Data_1.txt

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.

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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);

Amanullah Khan 2020-10-19

Thank you so much Mr Walter. It worked for me.

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Walter Roberson 2019-3-21

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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 2019-3-21

Thank you so much, this is really useful. Is V presented by the colorbar?

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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