[R] Boundaries and deldir

[Duncan Murdoch]

On 01/02/2015 10:26 PM, p_connolly wrote:
> Just what is meant by dummy points as referred to by the help for the
> deldir() function?  I understood they indicated the boundary beyond
> which triangulation would cease.

You should say what package you're asking about.  deldir() is not a base
R function.

Duncan Murdoch

> 
> I thought I would need the x/y elements (as described in the help file
> at the end of the description of the use of the dpl argument) to
> describe ad hoc dummy points as way to define a polygon or two as a
> boundary.  However, it gives this error:
> 
> Error in xd[-drop] : only 0's may be mixed with negative subscripts
> 
> Something internal is doing the negative subscripting.
> I tried ndx/ndy instead of x/y but it evidently refers only to a
> rectangle so not what I need.
> 
> Am I barking up the wrong tree altogether?  Is the boundary defined
> somewhere else entirely?  I need to get that clear before I am able to 
> provide
> useful example code.
> 
> TIA
> Patrick
> 
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