[Nauty-list] Issue with geng and showg

[Brendan McKay]

geng -n writes output in a binary format based on the internal data
structure of the graphs. It isn't documented because it is machine
dependent. I keep it because some legacy software wants it, but one
day I might take it out.

Brendan.


* Marcus Nunes <man238 at psu.edu> [110506 02:18]:
> Thanks, Keith. You solved my problem.
> 
> 
> 
> 
> On Thu, May 5, 2011 at 11:53, <keith.briggs at bt.com> wrote:
> 
> > When I do "geng -help" the -n option is not documented.  Why does geng
> > accept it?
> > The following works perfectly:
> >
> > geng  4 4:4  | showg
> >
> > Keith
> > ________________________________________
> > From: nauty-list-bounces at cs.anu.edu.au [nauty-list-bounces at cs.anu.edu.au]
> > On Behalf Of Marcus Nunes [man238 at psu.edu]
> > Sent: 05 May 2011 16:28
> > To: Nauty List
> > Subject: [Nauty-list] Issue with geng and showg
> >
> > Hi there
> >
> > I'm trying to use geng.c to generate and save my graphs. When I run
> >
> > ./geng -n 4 4:4  result.g6
> >
> > I get
> >
> > >A ./geng -d0D3 n=4 e=4
> > >Z 2 graphs generated in 0.00 sec
> >
> > But, when I try to use showg to read my output, I get
> >
> > ./showg result.g6
> > >E showg: illegal character
> >
> > It seems geng is not generating the graphs correctly. For the example
> > above, I have
> >
> >
> > ^D^@^@^@^@^@^@^@^@^@^@0^@^@^@^@^@^@^@^P^@^@^@^@^@^@^@???^@^@^@^@^@^@^@???^D^@^@^@^@^@^@^@^@^@^@0^@^@^@^@^@^@^@0^@$
> >
> > which, compared to examples I found on internet, doesn't make sense at all.
> >
> > Do you have some help to offer to me? I'm using Mac OS 10.6.7, gcc 4.2.1
> > and I have no experience with C. I want to generate the graphs and work with
> > them in R.
> >
> > Thanks
> > --
> > Marcus Nunes
> > man238 at psu.edu<mailto:man238 at psu.edu>
> > _______________________________________________
> > Nauty-list mailing list
> > Nauty-list at cs.anu.edu.au
> > http://dcsmail.anu.edu.au/cgi-bin/mailman/listinfo/nauty-list
> >
> 
> 
> 
> -- 
> Marcus Nunes
> man238 at psu.edu

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