[R] Function to find boundary of an irregular sample?

[Rolf Turner]

library(spatstat)
?ripras

Also, ``with user interaction'': ?clickpoly

HTH

	cheers,

		Rolf Turner

(Having said that, let me point out that it is a pretty dubious  
practice to
``let the data choose the window''.  The observation window is  
*always* determined
by separate considerations, and letting the data choose the window  
distorts the
information in the observed pattern.  Remember:  There is information  
in where
the data ***aren't*** as well as in where they are; to know where  
they aren't
you have to know the a priori determined observation window.)

		R. T.

On 3/12/2007, at 3:41 PM, Dale Steele wrote:

> Given a set of coordinates that form an irregular sampling area, is
> there an R function to determine boundary points (coordinates defining
> the limits of the area), either with or without user interaction ?
>
> # for example, given the following irregular sampling area, how could
> I define the boundary polygon?
> library(SemiPar)
> data(scallop)
> plot(scallop$longitude, scallop$latitude)
>
> Thanks.  --Dale
>
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