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Re: finding cluster boundary [message #79246 is a reply to message #79245]

Wed, 08 February 2012 15:51

Kenneth P. Bowman
Messages: 585
Registered: May 2000

Senior Member

In article <a3d4e3c3-b379-48fb-aea9-e98ed9af35e5@n8g2000pbc.googlegroups.com>,
biophys <biophys@gmail.com> wrote:

> Hi, Folks
>
> I've got a collection of 2D points that have already been identified
> as a cluster. Is there a quick way to extract the boundary points of
> the cluster? I understand the easiest way is to use TRIANGULATE
> procedure to get the boundary points in counterclockwise order.
> However, the points returned are like a convex envelope of the cluster
> which does not represent the real shape of the cluster. It looks like
> that I might need to specify that the edge of the boundary polygon can
> not be larger than a certain length. Any suggestions?

I don't think there is a unique definition of the 'boundary points'
in the way you are asking. How do you decide whether the boundary
should detour to an interior point or not?

Ken Bowman

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[Message index]

		Re: finding cluster boundary By: David Fanning on Wed, 08 February 2012 18:23
		Re: finding cluster boundary By: biophys on Wed, 08 February 2012 16:39
		Re: finding cluster boundary By: Kenneth P. Bowman on Wed, 08 February 2012 15:51

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