shortest path

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I haven't tested my function and hope it works well.

I'd suggest not to send untested code to this list, but rather share
your own attempts of testing it.

I tried Barry's function, hacked it, tried to plot the line segments in
black, and the shortest path in red, but it didn't plot a connected
path, so I'd be happy to see such a proof of concept.

Also, I strongly suggest in the following to use CRAN versions for
packages, that is if we use the old igraph, do a

require(igraph0)

however if we say

require(igraph)

we'd understand this as the current version on CRAN. In this particular
case, the packages are incompatible, and follow completely different
assumptions.

Edzer Pebesma
Institute for Geoinformatics (ifgi), University of M?nster
Weseler Stra?e 253, 48151 M?nster, Germany. Phone: +49 251
8333081, Fax: +49 251 8339763  http://ifgi.uni-muenster.de
http://www.52north.org/geostatistics      e.pebesma at wwu.de