[Nauty] gentreeg of n=2 vertices

Brendan McKay Brendan.McKay at anu.edu.au
Sat Aug 12 17:39:38 AEST 2017

Thanks Kevin,

The GENTREEG_MAIN problem was reported by Saul Spatz a few months ago.
The duplication for n=2 is more serious.  I'll fix this as soon as I can and
post a link to the corrected beta version when it is ready.


On 12/8/17 8:38 am, Kevin Ryde wrote:
> In the debian i386 packaged nauty 2.6r7, running "nauty-gentreeg 2" prints
>      >A nauty-gentreeg Z=1:1 D=1 n=2
>      >Z 2 trees generated in 0.00 sec
>      :An
>      :An
> where I thought preferably it shouldn't duplicate (for say consistency
> of counts of trees, etc).
> Nosing around the gentreeg.c code I noticed too GENTREEG_MAIN is used
> for renaming main() for use in a program, but at the end there's a
> #ifdef checking GENG_MAIN to do return vs exit.  Perhaps the latter
> would be GENTREEG_MAIN too?
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