plot magnitude data at location (x,y,z)
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I can't figure out how to plot magnitudes of a variable at different (x,y,z) locations. In effect, I need to plot a 4D plot, (x,y,z,value). I thought I'd be able to do a 3D plot and set the 4D as color scale or something like that, but I can't figure how to do that.
Perhaps I'm over thinking this....but, I'd appreciate any help.
Thanks!
Jorge
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Star Strider
2024-8-22,19:21
@Jorge —
Try this —
LD = load('data')
x = LD.data(:,1);
y = LD.data(:,2);
z = LD.data(:,3);
c = LD.data(:,4);
figure
stem3(x, y, z)
hold on
scatter3(x, y, z, 100, c, 'filled')
hold off
CL = clim;
colormap(turbo)
xlabel('X')
ylabel('Y')
zlabel('Z')
view(130,30)
Zfcn = scatteredInterpolant(x, y, z, 'natural','none'); % Create Surface Matrix
Cfcn = scatteredInterpolant(x, y, c, 'natural','none'); % Create Colour MAtrix
N = numel(x);
xv = linspace(min(x), max(x), N);
yv = linspace(min(y), max(y), N);
[Xm,Ym] = ndgrid(xv, yv);
Zm = Zfcn(Xm, Ym);
Cm = Cfcn(Xm, Ym);
figure
surfc(Xm, Ym, Zm, Cm, 'EdgeColor','interp')
clim(CL)
colormap(turbo)
xlabel('X')
ylabel('Y')
zlabel('Z')
view(130,30)
The only change from my previous answer was using your data. Some parts do not interpolate well and leave gaps, however that appears to be inhereint in your data, at least as far as scatteredInterpolant interprets them.
.
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Star Strider
2024-8-23,15:17
As always, my pleasure!
The purpose of MATLAB answers is to provide solutions, as well as education in various contexts.
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Aquatris
2024-8-22,13:34
编辑:Aquatris
2024-8-22,13:37
Here is one way where you use colors to indicate the magnitude;
% random data
x = [0:pi/50:10*pi nan]; % nan is added to remove connection between first and last data point
y = sin(x);
z = cos(x);
m = x; % magnitude you want as colors, i set it to x cause it looks nice :D
colormap(winter)
patch(x,y,z,m,'Facecolor','none','EdgeColor','interp')
colorbar
view(3)
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