#18327: Fix graph bounding box
-------------------------------------+-------------------------------------
Reporter: vbraun | Owner:
Type: defect | Status: needs_work
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/fix_graph_bounding_box | 57e13e6f294218589d95caf5122a1841ecbe71a0
Dependencies: | Stopgaps:
-------------------------------------+-------------------------------------
Changes (by vbraun):
* status: positive_review => needs_work
Comment:
{{{
sage -t --long src/sage/graphs/graph_generators.py
**********************************************************************
File "src/sage/graphs/graph_generators.py", line 511, in
sage.graphs.graph_generators.GraphGenerators
Failed example:
graphs_list.show_graphs(L) # long time
Expected nothing
Got:
doctest:1004: UserWarning: Unable to find pixel distance along axis
for interval padding; assuming no interval padding needed.
doctest:1011: UserWarning: Unable to find pixel distance along axis
for interval padding; assuming no interval padding needed.
**********************************************************************
1 item had failures:
1 of 33 in sage.graphs.graph_generators.GraphGenerators
[78 tests, 1 failure, 12.66 s]
}}}
This is because without the artificial padding of axes you can have graph
plots with extreme dimensions where the only two nodes are aligned along
one axis. Its not specific to graphs, though, you can trigger it without
as well:
{{{
sage: line([(1e-19,-1), (-1e-19,+1)], aspect_ratio=1.0)
/home/vbraun/Code/sage/local/lib/python2.7/site-
packages/matplotlib-1.3.1-py2.7-linux-x86_64.egg/matplotlib/axis.py:1004:
UserWarning: Unable to find pixel distance along axis for interval
padding; assuming no interval padding needed.
warnings.warn("Unable to find pixel distance along axis for interval
padding; assuming no interval padding needed.")
/home/vbraun/Code/sage/local/lib/python2.7/site-
packages/matplotlib-1.3.1-py2.7-linux-x86_64.egg/matplotlib/axis.py:1011:
UserWarning: Unable to find pixel distance along axis for interval
padding; assuming no interval padding needed.
warnings.warn("Unable to find pixel distance along axis for interval
padding; assuming no interval padding needed.")
Launched png viewer for Graphics object consisting of 1 graphics primitive
}}}
The warning means that matplotlib trips over floating point errors.
--
Ticket URL: <http://trac.sagemath.org/ticket/18327#comment:8>
Sage <http://www.sagemath.org>
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