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3D plot matlab from X Y Z data and integrating a slice function

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Hi I have a data formated in CSV file (unfortunately I cannot upload it cause it exceeds 5MB even if I compressed the file). However, my data is composed of 3 coordinates system XYZ which is assigned to a certain energy.
X Y Z Energy
0 0 1 48
having a dimension of 100 x 100 x 100
I tried this following code
X = Array(:, 1);
Y = Array(:, 2);
Z = Array(:, 3);
data = Array(:, 4);
colormap turbo
s=scatter3(X,Y,Z,20,data,'filled','s','MarkerEdgeColor','none') % draw the scatter plot
ax = gca;
ax.XDir = 'reverse';
% create and label the colorbar
cb = colorbar;
caxis([0 38.1])
cb.Label.String = 'Dose';
and the output is this
but I wanted to show like this instead with a grid box and slices so that could see what is happeninng inside the box


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Accepted Answer

Walter Roberson
Walter Roberson on 22 Jan 2021
If you have a regular grid of x y z points, then pull out the columns and reshape() and possibly permute() into an appropriate sized 3D grid of energy.
If the points are not regular, then pull out min and max x y z and linspace() vectors and ndgrid() to construct matrices X Y Z of coordinates to approximate the data at. Then scatteredInterpolant(x, y, z, Energy) and evaluate the resulting function at X Y Z to get a grid of energy.
Either way, you now have a 3D grid of energy that you can use slice() with.


Show 2 older comments
Walter Roberson
Walter Roberson on 30 Jan 2021
You have a lot of points, about half a million. Trying to plot them all would be really slow. The range is about -2800 to +89 . Even just an isosurface at +80 is slow as there are over 10000 irregularly-placed points above +80. It is difficult to see any structure in the data. I recommend that you
histogram(DG(:), 100)
and look at the distribution (and keep in mind that only 1% population would still be ~5000 points)
Denxybel Montinola
Denxybel Montinola on 6 Feb 2021 at 9:49
I am actually trying out different representations of my data and I agree about your point that I can hardly see any structure of my data. However, I have see some pattern from it. A big thanks for your help Walter, you're the best!
Walter Roberson
Walter Roberson on 6 Feb 2021 at 9:56
I think you might need to project your 4D data (three independent, one dependent) into 3D so that you have a chance of seeing continuous changes in a recognizable way. isosurfaces look just too irregular to make sense out of.

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