On 2012-11-06, at 12:32 , Frederic Vanhove <fvanh...@cage.ugent.be> wrote:
> gap> orbits:=Orbits(h,[1..12]); > [ [ 1, 2 ], [ 3, 4, 7, 8, 10, 12, 5, 6, 9, 11 ] ] > gap> OnSets(orbits[2],w); > OnSets: <set> must be a set (not a list (plain,cyc,nsort,imm)) > not in any function > Entering break read-eval-print loop ... > you can 'quit;' to quit to outer loop, or > you can replace <set> via 'return <set>;' to continue The error message tells you that the second orbit is not a set in the GAP sense (i.e., a strictly sorted list). As the documentation about Orbits states, the result contains lists of points, not necessarily sets. To do what you intended, just convert the list to a set first: OnSets(Set(orbits[2]),w); Regards, Burkhard. _______________________________________________ Forum mailing list Forum@mail.gap-system.org http://mail.gap-system.org/mailman/listinfo/forum
