>From what i see in the nauty web page, its license is not GPL compatible, since it forbids sale for profit or application with nontrivial military significance.
I guess that's the reason why it is not included as a standard package, right? On 23 mayo, 08:00, Dima Pasechnik <dimp...@gmail.com> wrote: > On 23 May 2013 13:52, Jason Grout <jason-s...@creativetrax.com> wrote: > > > On 5/23/13 12:34 AM, Dima Pasechnik wrote: > > >> can't the optional package nauty be used instead? Surely it can generate > >> all these graphs very quickly. > > > Indeed, if all you are doing is generating the graphs, yes. The graph > > database allows you to quickly query for graphs based on a number of > > different cached parameter values, though. You could do a list > > comprehension to calculate the parameters and discard the graphs you don't > > want, but the convenience of a precomputed database sometimes is what you > > want. > > nauty (more precisely, geng) can do some of this on the fly : > > Usage: geng [-cCmtfbd#D#] [-uygsnh] [-lvq] [-x#X#] n [mine[:maxe]] > [res/mod] [file] > > Generate all graphs of a specified class. > > n : the number of vertices > mine:maxe : a range for the number of edges > #:0 means '# or more' except in the case 0:0 > res/mod : only generate subset res out of subsets 0..mod-1 > -c : only write connected graphs > -C : only write biconnected graphs > -t : only generate triangle-free graphs > -f : only generate 4-cycle-free graphs > -b : only generate bipartite graphs > (-t, -f and -b can be used in any combination) > -m : save memory at the expense of time (only makes a > difference in the absence of -b, -t, -f and n <= 28). > -d# : a lower bound for the minimum degree > -D# : a upper bound for the maximum degree > - > > perhaps having a nice Sage interface to this is better than bothering > with a database (which would be quite small too) > > Dima > > > > > > > > > > > Thanks, > > > Jason -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-devel+unsubscr...@googlegroups.com. To post to this group, send email to sage-devel@googlegroups.com. Visit this group at http://groups.google.com/group/sage-devel?hl=en. For more options, visit https://groups.google.com/groups/opt_out.
