Greetings,
I'm running notebook mode, looking at acyclic directed graphs which
I'm forming from rational polygon fans -> cone_lattice() command ->
hasse_diagram() command. One of the things that would be very useful
would be a command to select only the elements on a specific level
(say, top minus two). However, I've been checking the sage
documentation for rational polyhedral fans.cone_lattice(), Directed
Graphs, and Hasse Diagrams, and no obvious or convenient command to do
this has emerged. My closest match so far is a double for nesting
procedure off of fan.cone_lattice().level_sets()[-3:-2]
for l in L.level_sets()[-3:-2]:
print [f.element.ambient_ray_indices() for f in l]
but this returns a list of some sort, the elements from which I
haven't yet been able to address individually (aside from indirectly
as in the double for). Is there a better command to select these
elements than this procedure above, and if the procedure is the best
option available, is there a good way to address the individual
elements of the resulting list?
Thanks in advance,
Ryan Davis
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