[Nauty] canonical label for directed graphs
gordon at csse.uwa.edu.au
Wed Aug 3 22:23:56 EST 2005
nauty already computes canonical labellings for directed graphs....
there is no need to modify the algorithm.
However the default settings for the "options" structure is to have
options.digraph set to FALSE - presumably because some speed can be
gained if the algorithm can rely on the input being undirected
without actually confirming that edge j-i is present when it notices
So, just set options.digraph = TRUE before your call to nauty, and it
will treat it as a directed graph
On 03/08/2005, at 7:46 PM, Edward N Turner wrote:
> Dear all,
> Nauty currently allows us to find canonical labels for undirected
> - would it be possible to modify the algorithm it uses to obtain
> canonical labels for directed graphs?
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