From Brendan.McKay at anu.edu.au  Sun Oct 15 21:44:52 2017
From: Brendan.McKay at anu.edu.au (Brendan McKay)
Date: Sun, 15 Oct 2017 21:44:52 +1100
Subject: [Nauty] new version of nauty available
Message-ID: <0ebae24d-425f-ad99-cbd5-5e3711c48ba2@anu.edu.au>

Release 2.6r10 of nauty&traces is available on the web site. The
changes are:

* Problems with input of graphs with 0 vertices were fixed with help
 ? from Kevin Ryde.? However, note that many utilities in the package
 ? will not work with such null graphs.? It is NOT TRUE that graphs of
 ? order 0 are now supported.? If you need them in your own code
 ? I suggest you treat them separately.

* The configuration script was improved with help from Kevin Ryde.

* Stronger measures are taken to ensure that the sort order used by
 ? shortg is plain byte order. This corresponds to the C collation
 ? order, also known as POSIX, but it may be different from the
 ? collation order used by default on your command line. This means
 ? that utilities like sort, uniq, comm and join might consider the
 ? output of shortg to be out of order. To avoid this, define the
 ? environment variable LC_ALL to equal the string "C".
 ???? bash:?? export LC_ALL=C
 ???? tcsh:?? setenv LC_ALL C
 ? If LC_ALL is undefined, it will also be sufficient to define
 ? LC_COLLATE to equal "C".? The POSIX standard says that LC_ALL
 ? takes precedence over LC_COLLATE if both are defined, but this
 ? might not be true for older systems.? If you really don't want
 ? to change environment variables, you can compile shortg with
 ? -DKEEP_SORT_LOCALE but beware that some collation orders are
 ? not even deterministic (i.e. different characters might compare equal).

Beta release 2.7b10 is also available.? In addition to the above,
the main routine nauty() now works for null graphs and some
utilities work for them too.? However, null graphs are not uniformly
supported through the package.? In addition, watercluster2 has
a new option Z for digraph6 output.? Recall that watercluster2 is
a program from Gunnar Brinkmann that is often much faster than
directg.

Brendan.