Outer Bounds of a Dataset

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Saeid 2020-7-15

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评论： Saeid 2020-7-16

I have a set of xy data and I want to find the outer bounds of this set so that when I plot the data and connect these outer bound points, all ther other points will be confined to these boundaries, as shown if figure.

How can I do that?

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Answer 1

Image Analyst 2020-7-15

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https://ww2.mathworks.cn/matlabcentral/answers/565550-outer-bounds-of-a-dataset#answer_466208

You can try boundary(). There is a shrink factor input to determine how closely the boundary "hugs" the point set. The shrink factor is a scalar between 0 and 1. Setting s to 0 gives the convex hull, and setting s to 1 gives a compact boundary that envelops the points. The default shrink factor is 0.5.

x = gallery('uniformdata',30,1,1);
y = gallery('uniformdata',30,1,10);
plot(x,y,'.')
xlim([-0.2 1.2])
ylim([-0.2 1.2])
k = boundary(x,y);
hold on;
plot(x(k),y(k));