#13528: ymin is not respected in logarithmic plots
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Reporter: ppurka | Owner: jason, was
Type: defect | Status: new
Priority: major | Milestone: sage-5.4
Component: graphics | Resolution:
Keywords: log plot, ymin | Work issues:
Report Upstream: N/A | Reviewers:
Authors: | Merged in:
Dependencies: | Stopgaps:
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Description changed by ppurka:
Old description:
> See this [https://groups.google.com/forum/?fromgroups=#!topic/sage-
> devel/OnhVtHXgdls sage-devel thread]
>
> I've been experiencing some problems with logarithmic scale plots
> since the 'semilogy', 'semilogx' and 'loglog' options had been added.
> For example, when I use the 'semilogy' plot, I can adjust the 'ymax'
> value, but not 'ymin' value. 'ymin' is always set automatically, and
> not always correctly.
>
> {{{
> dPhi = 6.02e10 * x**(2.481) * exp(-x / 1.205)
> plot(dPhi, 0, 20, scale='semilogy', figsize=(5,4), ymin=1e7, ymax=1e11,
> xmin=0, xmax=20, frame=True)
> }}}
New description:
See this [https://groups.google.com/forum/?fromgroups=#!topic/sage-
devel/OnhVtHXgdls sage-devel thread]
1. I've been experiencing some problems with logarithmic scale plots since
the 'semilogy', 'semilogx' and 'loglog' options had been added. For
example, when I use the 'semilogy' plot, I can adjust the 'ymax' value,
but not 'ymin' value. 'ymin' is always set automatically, and not always
correctly.
2. I have also noticed that if I have several curves on a single
'semilogy' plot, the lower Y limit is set according the minimum value of
the FIRST curve.
Example showing weird behavior on decreasing `ymin` to `1e3`, `1e4`, etc.,
but exhibiting correct behavior on changing `ymax`.
{{{
dPhi = 6.02e10 * x**(2.481) * exp(-x / 1.205)
plot(dPhi, 0, 20, scale='semilogy', figsize=(5,4), ymin=1e7, ymax=1e11,
xmin=0, xmax=20, frame=True)
}}}
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13528#comment:2>
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