Removing negative values of 3d data
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Hello, I have a diagram where I want to get rid of the lower portion (the points which have negative z value) so I can use scatteredInterpolant on it. How would I do this?
The points are stored in a 3D array with index (1,1,1) being an x-value, (1,1,2) being the corresponding y value and (1,1,3) being the corresponding z value.
Thanks!
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/967200/image.png)
Réponse acceptée
Chunru
le 18 Avr 2022
Modifié(e) : Chunru
le 19 Avr 2022
x = load("ggv.mat");
GGV = x.GGV;
figure
surf(GGV(:,:,2), GGV(:,:,3), GGV(:,:,1), 'EdgeColor', 'none');
xlabel('x'); ylabel('y')
figure
% to demonstrate limit works for X data (Z in the plot)
surf(GGV(:,:,2), GGV(:,:,3), max(GGV(:,:,1), -20), 'EdgeColor', 'none'); % -20 and above
xlabel('x'); ylabel('y')
% The number of points for z<0
sum(GGV(:, :, 3) < 0, 'all')
min(GGV(:, :, 3), [], 'all')
figure
% limit z data here will not make no change since no z is less than 0
surf(GGV(:,:,2), max(GGV(:,:,3), 0), GGV(:,:,1), 'EdgeColor', 'none');
xlabel('x'); ylabel('y')
figure
% limit GGV(:,:,1)
surf(GGV(:,:,2), GGV(:,:,3), max(GGV(:,:,1), 0), 'EdgeColor', 'none');
xlabel('x'); ylabel('y')
zlim([-80 20])
3 commentaires
Tim Albertsson
le 16 Fév 2024
Hi! How did you get the GGV points from the start? I'm trying to make my own script for this and I've gotten the max lat and lon accelerations for the different speeds but not the full (GG "elipse").
Plus de réponses (1)
Chunru
le 18 Avr 2022
% Your data
data = randn(357, 177, 3);
% limit to 0
data(:, :, 3) = max(data(:, :, 3), 0); % to limit the surface up to 0
% You may also want to try nan (depending on how you plot the data)
idx = data(:, :, 3) < 0;
data(idx, 3) = nan;
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