#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):
Ok, the root of the problem is in the `get_minmax_data` method of
`MatrixPlot`. This deliberately flips the y axis so that "the picture
looks correct.", but it confounds the `_limit_output_aspect_ratio` method
of `Graphics` which expects ymax-ymin to be positive. I see a bunch of
choices
1) We can have `output_aspect` be the absolute value of what it is now.
But this works but this leaves `ymax < ymin` ready to bite someone else
who expects min < max.
2) We can display matrices upside down. This seems unreasonable.
3) We can flip the xy_data_array in the Matrix plot constructor. This
feels wrongish, it means making a copy of the array.
To me 1 seems the best choice, but I am not familiar enough with the
Graphics object to be comfortable with it.
Hope this helps
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Ticket URL: <http://trac.sagemath.org/ticket/18463#comment:3>
Sage <http://www.sagemath.org>
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