#19586: Add is_cayley_graph
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Reporter: jaanos | Owner:
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-6.10
Component: graph theory | Resolution:
Keywords: Cayley graphs | Merged in:
groups | Reviewers:
Authors: Janoš Vidali | Work issues:
Report Upstream: N/A | Commit:
Branch: | 4aaf3014fee5bb08d861636908d6733047d4a869
u/jaanos/add_is_cayley_graph | Stopgaps:
Dependencies: |
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Comment (by dimpase):
Replying to [comment:35 jaanos]:
>
> > only the generators? Why? it's one quick function call away from the
group, why would you
> > do this in library code? In particular, as you are computing the
group, not its generators, in the first place.
>
> Well, I think if we're giving the user the choice of what they want
returned, it would be unreasonable to forbid a certain choice just because
we see no use for it.
it's an unreasonable code bloat to include a special function for anything
that is
a trivial one-liner; e.g. if you start returning the generators, you might
be tempted to add a function that only returns the number of generators,
etc etc :-)
And you are not depriving the user from getting what he wants in any way
by not providing
an option for any trivial one-liner applied to the return value, not at
all..
IMHO it's also against the spirit of OOP to have an option in a function
`f` to return either `X` or `X.blah()`; the user can call `.blah()` on the
answer he gets himself; and `X` is already created in `f`, there is no
performance gain in returning X.blah() instead of `X`.
--
Ticket URL: <http://trac.sagemath.org/ticket/19586#comment:36>
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