[STATSGRASS] R contour(): x,y output

[Agustin Lobo]

I forward this message (with permission) 
as I think that it is interesting for the 
list.

Agus

Dr. Agustin Lobo
Instituto de Ciencias de la Tierra (CSIC)
Lluis Sole Sabaris s/n
08028 Barcelona SPAIN
tel 34 93409 5410
fax 34 93411 0012
alobo at ija.csic.es


---------- Forwarded message ----------
Date: Thu, 21 Mar 2002 10:37:08 +1200
From: Paul Murrell <p.murrell at auckland.ac.nz>
To: Agustin Lobo <alobo at ija.csic.es>
Subject: Re: suggestion

Hi


> Paul,
> your TODO list in
> http://developer.r-project.org/paul-todo.html
> mentions
> "* I am compiling a list of missing features or inconsistencies in R
> graphics that I'd like to get to..."
>
> Related to this, would it be possible to get the x,y coordinates
> of the vertices in the contours() function? I mean a couple
> of vectors that could be plotted with lines(). Having this, it
> would be possible to write a a function to write these
> coordinates to a file in dxf format, which would be very
> useful for linking R to GIS packs.


I agree this is a good idea.  There is a plan to do just such a thing in
order to make contour plotting possible in the lattice package.  The bad
news:  I suspect the next time I'll get a chance to try and do this is
probably only for R1.6 (i.e., for around September some time I think).
Would that still be useful to you?

Paul