#18289: Revert the changes that #17821 made to graph/
-------------------------------------+-------------------------------------
Reporter: vbraun | Owner:
Type: defect | Status: needs_review
Priority: major | Milestone: sage-6.7
Component: graph theory | Resolution:
Keywords: | Merged in:
Authors: Volker Braun | Reviewers: Nathann Cohen
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/vbraun/faster_output_for_large_graphs|
e9e7759f34e46e610f9f477e433919893973cf37
Dependencies: | Stopgaps:
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Comment (by ncohen):
> But when the user types
> {{{
> sage: g = compute_some_graph()
> sage: g
> }}}
> then they do not want a picture? The displayhook is just an implicit way
of telling the UI to show something.
A plot is just 'one representation' of a graph. Like for posets, for
matrices (they have a .plot too). I type 'g' very often just to see
whether this variable that is named 'g' in indeed a graph (as you would
for any other Python object), but also because it tells me whether that
graph allows multiple edges or loops.
This being said, like Vincent I expect that the expected behaviour is
different in the notebook. If you want to improve that side of the
interface, however, I believe that it might be better to output *both* in
the notebook:
- The one-line description that we have in the console
- A drawing
Of course, not being able to plot large graphs is a problem. So like for
matrices, perhaps a size limit may be good.. But really, most graphs do
*NOT* look good when you plot them, and the result may appear very very
very unprofessional, which is probably something you want to avoid:
{{{
sage: graphs.RandomGNP(50,.5).show()
}}}
Perhaps the default layout can be slightly improved, but I have no idea
how to solve the performance problem with matplotlib.
> Unrelated to this ticket, but I agree that we don't want huge tikz
output.
Why is that unrelated to this ticket? Didn't you say that this change
(from picture to latex output) had been made by #17821?
> Bonus points if you can guess correctly what happens without trying it
out (I could not)
With this branch applied it gives me the latex code `O_o`
Nathann
--
Ticket URL: <http://trac.sagemath.org/ticket/18289#comment:45>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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