plot magnitude data at location (x,y,z)
69 views (last 30 days)
Show older comments
Jorge
on 22 Aug 2024 at 13:27
Commented: Star Strider
on 23 Aug 2024 at 15:17
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
0 Comments
Accepted Answer
Star Strider
on 22 Aug 2024 at 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.
.
13 Comments
Star Strider
on 23 Aug 2024 at 15:17
As always, my pleasure!
The purpose of MATLAB answers is to provide solutions, as well as education in various contexts.
More Answers (1)
Aquatris
on 22 Aug 2024 at 13:34
Edited: Aquatris
on 22 Aug 2024 at 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)
See Also
Categories
Find more on Surface and Mesh Plots in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!