#18463: matrix_plot broken in Sage 6.7
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Reporter: jhpalmieri | Owner:
Type: defect | Status: new
Priority: critical | Milestone: sage-6.8
Component: graphics | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Comment (by deinst):
Replying to [comment:8 kcrisman]:
> > Looking through the `matplotlib` method of the `Graphics` object, I
see that the `matplotlib` method expects `ymin > ymax` to occur.
> Or rather, it allows for that case and then flips things, if I recall
correctly.
Yes, sort of. If `ymax < ymin` the labels on the y axis will go from top
to bottom. Everything seems to work exactly as if `ymin` and `ymax` were
in the right order except that (and the `_limit_output_aspect_ratio`
method).
> > This works but this leaves ymax < ymin ready to bite someone else who
expects min < max.
> Can you give a concrete example of this kind of "user error"? That
might help us decide on an option.
I did not mean a "user error", I meant a "developer error", identical to
the error that precipitated this bug. (As I suspect the set of most
regular sage users overlaps considerably with the community of sage
developers, this may only be a semantic difference.) When I see two
variables named `xmin` and `xmax`, I assume that `xmin < xmax` and program
accordingly.
I am not sure how all of this interacts with sums of plots, which was
Volker's point.
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Ticket URL: <http://trac.sagemath.org/ticket/18463#comment:9>
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