#13430: log plots blank with points, but fine with lines
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Reporter: jason | Owner: jason, was
Type: defect | Status: new
Priority: major | Milestone: sage-5.4
Component: graphics | Resolution:
Keywords: | Work issues:
Report Upstream: N/A | Reviewers:
Authors: | Merged in:
Dependencies: | Stopgaps:
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Comment (by ppurka):
About the second plot in comment:1 - this is fixed on adding #13528. Don't
ask me why. `^_^`
About the original question, the problem with the plot is that the point
`x=0` is present in the plot. This is a documented fail situation - look
at the doc `list_plot?` or `point2d?`, both of which mention that non-
positive points should not be used in the log scale. This is the reason
why `point` works with `semilogy` scale and not with `semilogx` or
`loglog`.
Instead, both these commands work:
{{{
sage: points(zip(*(range(1,len(ber)+1), ber))).show(scale='loglog')
sage: points(zip(*(range(1,len(ber)+1), ber))).show(scale='semilogx')
}}}
If you want to use the `x=0` point, then use `list_plot` along with
`plotjoined=True, linestyle='', marker='o'`:
{{{
sage: list_plot(list(enumerate(ber)), plotjoined=True, linestyle='',
marker='o').show(scale='semilogx')
sage: list_plot(list(enumerate(ber)), plotjoined=True, linestyle='',
marker='o').show(scale='semilogy')
sage: list_plot(list(enumerate(ber)), plotjoined=True, linestyle='',
marker='o').show(scale='loglog')
}}}
This latter command runs through the `line` command in Sage, which uses
the usual `plot` of matplotlib. `plotjoined=False` runs through the
`point` command of Sage, which uses the `scatter` command of matplotlib.
So, the failure of `x=0` in log scale is from the scatter command in
matplotlib.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13430#comment:2>
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