arcs: Extract a list of arcs from a triangulation object.
Description
This function extracts a list of arcs from a triangulation object
created by tri.mesh.
Usage
arcs(tri.obj)
Value
A matrix with two columns "from" and "to" containing the
indices of points connected by the arc with the corresponding row index.
Arguments
tri.obj
object of class triSht
Author
Albrecht Gebhardt <albrecht.gebhardt@aau.at>,
Roger Bivand <roger.bivand@nhh.no>
Details
This function acesses the arcs component of a triangulation
object returned by tri.mesh and extracts the arcs
contained in this triangulation. This is e.g. used for plotting.