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Outer Bounds of a Dataset

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Saeid
Saeid on 15 Jul 2020
Commented: Saeid on 16 Jul 2020
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?

Accepted Answer

Image Analyst
Image Analyst on 15 Jul 2020
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));
  1 Comment
Saeid
Saeid on 16 Jul 2020
This works wondefully. Thank you!

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