Division of a vector

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massimiliano de martino 2019-9-10

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https://ww2.mathworks.cn/matlabcentral/answers/479792-division-of-a-vector

评论： darova 2019-9-11

Goodmorning,

I would like to have help about that question: i've a vector which rapresents different zones in a 2D space.Main problem is that coordinates of differents zone are all togheter in one single vector,whereas i would like to have one different vector for each zone.

Attached i've reported two images which represent current situation:

In image 1 - i've reported current situation, in which i've one single vector with the coordinate of the four zones
In image 2 - i've reported desired situation, in which i've one vector for each zone.

I would like to know if there is a commande which is able to split vector,recognize different zones.

Attached a SavedWorkspace with one coordinate example, which can be used with following line code to plot the situation.

figure(1);grid on;hold on;
scatter(Zone_1_Overlap_Complete_Not_Zeros(:,1),Zone_1_Overlap_Complete_Not_Zeros(:,2),2);
hold off

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Matt J 2019-9-10

In your example, the zones all appear to be convex. Will this always be the case?

massimiliano de martino 2019-9-11

Goodmorning,

It could happen that some of these zones can not be convex but concave.

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Answer 1

darova 2019-9-10

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https://ww2.mathworks.cn/matlabcentral/answers/479792-division-of-a-vector#answer_391298

Try clusterdata()

load WorkSpace
X = Zone_1_Overlap_Complete_Not_Zeros(:,1);
Y = Zone_1_Overlap_Complete_Not_Zeros(:,2);
idx = clusterdata([X Y],'maxclust',4);
scatter(X,Y,3,idx,'filled')