Use ordering points to identify the clustering structure (OPTICS) for seriate().
Details
Registers the method "optics" for seriate(). This method applies
the OPTICS ordering algorithm implemented in dbscan::optics() to create an ordering.
Note: Package dbscan needs to be installed.
References
Mihael Ankerst, Markus M. Breunig, Hans-Peter Kriegel, Joerg Sander (1999). OPTICS: Ordering Points To Identify the Clustering Structure. ACM SIGMOD international conference on Management of data, ACM Press, pp. 49-60. doi:10.1145/304181.304187
Examples
if (FALSE) { # \dontrun{
register_optics()
get_seriation_method("dist", "optics")
d <- dist(random.robinson(50, pre=TRUE, noise=.1))
o <- seriate(d, method = "optics")
pimage(d, o)
} # }