That's great, it works. Thank you! -William On Tue, Mar 22, 2011 at 3:37 PM, Russ Woodroofe <r...@cornell.edu> wrote: > > > Dear William, > Here's a short sample, which relabels an inserted Sylow 2-subgroup of > S_4 as P_2: > > G:=SymmetricGroup(4); > Sym( [ 1 .. 4 ] ) > > L:=GraphicSubgroupLattice(G); > <graphic subgroup lattice "GraphicSubgroupLattice"> > > H:=SylowSubgroup(G,2); > Group([ (1,2), (3,4), (1,3)(2,4) ]) > > ret:=InsertVertex(L, H); > [ <vertex of graphic graph, label: "2", Serial:6>, true ] > > Relabel(L, ret[1], "P_2"); > > I think you should be able to work this around to your own situation. > > The subgroup lattice library seems to internally use Relabel to label > the vertices, and I don't see it pulling information from the subgroup itself > -- though I didn't look terribly carefully. But the above sample should make > relabeling things under program control not too inconvenient... > > Sincerely, > > --Russ Woodroofe > > PS: If you're using a Mac, let me recommend my native "Gap.app" front-end, > which is a workalike for xgap. Available at > http://cocoagap.sourceforge.net/ > > > On Mar 22, 2011, at 4:52 PM, William DeMeo wrote: > >> Dear Forum, >> >> Is it possible to change the labels of vertices in a subgroup lattice >> drawn by XGAP using the command line (rather than using "Change >> Labels" in the "Poset" menu)? >> >> Here's an example: >> >> L:=GraphicSubgroupLattice(G1xG2); >> >> InsertVertex(L, HxK); >> # insert here some command to change vertex label to "HxK" >> >> InsertVertex(L, HxG2); >> # insert here some command to change vertex label to "HxG2" >> >> InsertVertex(L, G1xK); >> # insert here some command to change vertex label to "G1xK" >> >> intsubs:=IntermediateSubgroups(G1xG2, HxK); >> for j in [1..Size(intsubs.subgroups)] do >> InsertVertex(L,intsubs.subgroups[j]); >> od; >> >> After I execute the loop, it's hard to tell what's what unless I have >> already changed some labels with names like "HxK", "HxG2", etc. before >> the loop. Using the menu to do this each time is a bit tedious. >> >> (Also, it would be nice if I could use some stored list of short names >> -- maybe acquired from StructureDescription -- to insert labels inside >> the loop as well, but maybe that's asking too much... and perhaps such >> a labelling would be even harder to interpret than the default number >> labels; e.g. when the names are not unique.) >> >> Thanks in advance for any tips! >> >> -William >> >> _______________________________________________ >> Forum mailing list >> Forum@mail.gap-system.org >> http://mail.gap-system.org/mailman/listinfo/forum > >
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