[R] Odp: alphahull: is low level plotting possible?

Petr PIKAL petr.pikal at precheza.cz
Thu Jun 16 17:12:42 CEST 2011


Hi
> 
>  Dear R users,
> I am using package alphahull version 0.2-0 with R-2.13.0. Here is my 
problem.
> I have produced a 2-D plot of points and need to draw convex hulls 
around 
> some subsets of these points. So I just need to add the convex hulls to 
> the already existing plot. That is why I cannot use the plot.hull 
> function. So, is there a way to just add the convex hulls to the already 

> existing plot, just as the low level functions "lines" and "points" add 
> lines and points to an already existing plot? I suspect the solution is 
in
> the "arc" function, but I am not sure.

See ?chull and its help page.

Regards
Petr

> 
> Any suggestions will be appreciated.
> 
> Regards,
> 
> Martin
> 
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