Delete Negative Duplicates from Array
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I have a 3-by-n array of points representing the vertices of a polyhedron. I need to identify all the axes that pass through the origin and a vertex, so I need to identify and remove all the points x where -x also exists in the array. I can manage this by iterating through every point and finding negatives, but it feels like there should exist a sneaky way to use the unique function to do the same thing but better.
Thanks in advance!
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Catalytic
2024-3-25
X=rand(3,4); X=[X,-X(:,1)]
[~,~,G]=unique([X,-X]','rows');;
[N,~,bin]=histcounts(G,1:max(G)+1);
bin=bin(1:end/2);
X(:,N(bin)>1)=[]
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