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)
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Chunru
2022년 4월 18일
편집: Chunru
2022년 4월 19일
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])
댓글 수: 3
Tim Albertsson
2024년 2월 16일
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").
추가 답변 (1개)
Chunru
2022년 4월 18일
% 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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