The procedure I am calling does not use GAP or nauty. The algorithms nauty uses were written, from scratch, in Cython by Robert Miller. I'm not sure what the problem is since the same command seems to work correctly in other examples.
On Mon, Dec 13, 2010 at 4:56 AM, William Laffin <[email protected]> wrote: > No doubt coming from the automorphism moving blocks no? > In gap try this: >>LoadPackage("Design"); > >>b:=BlockDesign(9,[ > [1,2,3], > [4,5,6], > [7,8,9], > [1,5,9], > [2,6,7], > [3,4,8], > [3,5,7], > [1,6,8], > [2,4,9], > [1,4,7], > [2,5,8], > [3,6,9]]);; >>g:=AutomorphismGroup(b); > > What set is g acting on? I can't tell, I'm on windows right now, and > the linux machine i have access too does not have nauty or design > configured correctly with GAP. But I'm pretty sure your error comes > from nauty giving the permutation group on blocks and not points. > > > On Thu, Dec 2, 2010 at 2:16 PM, David Joyner <[email protected]> wrote: >> Hi: >> >> I'l not sure why the following error arises. >> >> >> sage: from sage.combinat.designs.block_design import steiner_triple_system >> sage: sts = steiner_triple_system(9) >> sage: sts.block_design_checker(2,9,3,1) >> True >> sage: sts.parameters() >> (2, 9, 3, 1) >> sage: B = sts.blocks() >> sage: sts.points() >> [0, 1, 2, 3, 4, 5, 6, 7, 8] >> sage: BD = BlockDesign(9, B) >> sage: BD.automorphism_group() >> --------------------------------------------------------------------------- >> TypeError Traceback (most recent call last) >> >> ..... >> >> TypeError: permutation PermList([1, 2, 4, 3, 8, 12, 11, 5, 9, 10, 7, >> 6]) not in SymmetricGroup(9) >> >> >> >> Does anyone on this list have an idea? >> >> - David Joyner >> >> -- >> To post to this group, send email to [email protected] >> To unsubscribe from this group, send email to >> [email protected] >> For more options, visit this group at >> http://groups.google.com/group/sage-support >> URL: http://www.sagemath.org >> > -- To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
