#14291: Orbits of tuples and sets
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Reporter: ncohen | Owner: joyner
Type: enhancement | Status: needs_work
Priority: major | Milestone: sage-5.9
Component: group theory | Resolution:
Keywords: | Work issues:
Report Upstream: N/A | Reviewers:
Authors: Nathann Cohen | Merged in:
Dependencies: | Stopgaps:
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Comment (by ncohen):
> The current setup allows it to be extended by the user. One can install
via {{{gap.eval()}}} a GAP function, say, {{{"OnBlah"}}}, and then use
it. You can't do this with a module variable.
Well, if a action is being used that is not already in the source code,
then there is no way for Sage to guess how to translate the result before
returning it, is there ?
Otherwise we could just get rid of this list, cross our fingers when GAP
is fed with something we ha not thought of, as it would raise an Exception
in the worst case ?..
> sure this can be done as you prefer. However, there is a more serious
issue with {{{self.action}}}:
Arg. Right `:-/`
> Indeed, {{{_domain_to_gap[x] }}} needs to be applied onto such orbits. I
am thinking that one should have recursive function version of
> {{{_domain_to_gap[x] }}} and of {{{_domain_from_gap[x] }}} to deal with
things like sets, sets of sets, etc in one go rather
> than call them explicitly.
>
> One can also (or instead) attach such a pair of functions to each action
in {{{supported_actions}}} to do this rewriting.
Hmmmm... I don't like it very much to be honest... In these situations I
think that a bit of code duplication is better than a weird generic way to
handle it.
Nathann
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/14291#comment:12>
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