MATLAB: How to highlight the vertex (vertices) of a voronoi diagram

aida

This is the program i have written. How do i highlight (bold) the vertex?

x=[1 1 1 1 1 1 1 2 2 2 2 2 3 3 3 3 3 3 3 4 4 4 4 4 4 4 4 5 5 6 6 7 7 7 8 8 8 8 9 9];
y=[1 3 5 7 8 9 10 2 3 4 6 9 1 2 3 5 7 8 10 1 2 4 5 7 8 9 10 1 2 5 8 2 4 8 1 4 6 8 5 7]; 
axis([0 10 0 10]); 
hold on;
scatter(x, y, [], 'filled'); 
[vx,vy] = voronoi(x,y)
plot(vx,vy,'red')

Best Answer

you can use scatter to plot/highlight the vertices of the Voronoi diagram by adding the lines of code below at the end of your code.

scatter(vx(1,:),vy(1,:),'black');
scatter(vx(2,:),vy(2,:),'black');

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Start with "If an entry in B is greater than or equal to zero": You can either run a loop over all elements of B or use "logical indexing":

% Linear indexing:
for k = 1:numel(B)
   if B(k) >= 0
     ...
   end
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Or two indices for rows and columns:

for r = 1:size(B, 2)
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    if B(r, c) >= 0
       ...
    end
  end
end

Or "logical indexing":

index = (B >= 0);
disp(B(index))

Now try to use this to modify B. Use the mentioned terms to search in the documentation and in the internet.

Best Answer

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