#18612: Y-axis labels on matrix_plot are reversed.
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Reporter: deinst | Owner:
Type: defect | Status: new
Priority: blocker | 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 kcrisman):
{{{
sage: p = 13; matrix_plot(matrix(p-1,[mod(a,p)^b for a in range(1,p) for b
in srange(p)]),cmap='jet')
Launched png viewer for Graphics object consisting of 1 graphics primitive
}}}
Looks great, but y-axis labels reversed (known bug from #18463).
{{{
sage: p = 13; matrix_plot(matrix(p-1,[mod(a,p)^b for a in range(1,p) for b
in srange(p)]),cmap='jet', origin='lower')
Launched png viewer for Graphics object consisting of 1 graphics primitive
}}}
Labels correct, but image upside-down.
----
Could we just ("just") use
[http://matplotlib.org/api/pyplot_api.html#matplotlib.pyplot.yticks
pyplot.yticks] to get the vertical ticks and then immediately reverse
their order? Or something like
{{{
sage: m.gca().get_yticks()
array([ -2., 0., 2., 4., 6., 8., 10., 12.])
sage: m.gca().set_yticks(m.gca().get_yticks()[::-1])
}}}
I can't get this to quite work because I don't have the tkagg enabled for
my Sage matplotlib, but inside of Sage something doing this should
(hopefully) work.
http://stackoverflow.com/questions/9382664/python-matplotlib-imshow-
custom-tickmarks
http://matplotlib.org/api/axes_api.html#matplotlib.axes.Axes.get_yticks
--
Ticket URL: <http://trac.sagemath.org/ticket/18612#comment:2>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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