#15320: plot_semilogx(1/log(x),10,10^15) should look like plot(1/x,1,15)
------------------------+--------------------------------------------------
Reporter: slabbe | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-5.13
Component: graphics | Keywords: adaptive refinement, log scale
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
------------------------+--------------------------------------------------
The adaptive refinement plotting code is not well adapted for a
logarithmic scale on the x axis.
In the following example, where the x ranges from `10` to `10^15` no
values are computed between `10` and `10^12` which is a big part of the
plot when drawn on a logarithmic scale. The plot is linear from `x=10` to
`x=10^12` which is quite weird; it should look like the inverse of x :
{{{plot(1/x,1,15)}}}.
{{{
plot_semilogx(1/log(x),10,10^15)
}}}
By changing the left most point of the interval, we confirm the problem:
{{{
sage: p =
plot(1/log(x),10,10^15,scale='semilogx',color='blue',thickness=3)
sage: q = plot(1/log(x),100,10^15,scale='semilogx',color='red',
thickness=3)
sage: r =
plot(1/log(x),1000,10^15,scale='semilogx',color='green',thickness=3)
sage: p+q+r
}}}
Also, the semilogx plots looks thinner than usual. I don't know why. This
is why I increase the thickness.
--
Ticket URL: <http://trac.sagemath.org/ticket/15320>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
--
You received this message because you are subscribed to the Google Groups
"sage-trac" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To post to this group, send email to [email protected].
Visit this group at http://groups.google.com/group/sage-trac.
For more options, visit https://groups.google.com/groups/opt_out.
