[Nauty] Calling nauty()

[Brendan McKay]

Hello.  The 2nd and 3rd arguments must be given as arrays.  When
options.defaultptn = TRUE, the values in those arguments are ignored
but the arrays are still used for working purposes.  The only 
argument which can be NULL in the case of options.getcanon = TRUE
is the 4th argument (active).

NILSET is an obsolete name, just use NULL.

Also check that you have defined workspace to be an array of
at least 160*NMAX setwords.

Brendan.


* Wahid Chrabakh <chrabakh at cs.ucsb.edu> [040210 15:35]:
> Hi:
> 	I want to use the nauty function to get the canonical form of a graph.
> 	I tried setting the proper options so that I can call the function
> 	with lab and ptn arguments set to NULL. This results in a segmentation
> 	fault. This is the code I use:
> 	static DEFAULTOPTIONS(options);
> 	options.writeautoms = FALSE;
> 	options.writemarkers = FALSE;
>   options.getcanon = TRUE;
> 	options.defaultptn = TRUE;
> 	options.digraph = FALSE;
> 	nauty(g,NULL,NULL,NILSET,orbits,&options,&stats,workspace,160*NMAX,m,n,canong);
> 
> 	The manual specifies that if defaultptn=TRUE then arguments 2 and 3
> 	are ignored, thus they can be set to NULL.
> 	
> 	I am only interested in canong. I would like to know what the minimal set of 
> arguments I need to specify to get canong?
> 	Do I have to specify orbits, stats and workplace or is there a way to
> 	set some of them to NULL?
> 
> 	thanks,
> 	Wahid.
> 
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