Re: [Matplotlib-users] How has dates and autoscaling changed from 0.91.2 to 0.98.5.2

[Joshua J. K. <jo...@ee...>]

On Wednesday 20 May 2009, John Hunter said something like:
> On Wed, May 20, 2009 at 9:36 PM, Joshua J. Kugler 
<jo...@ee...> wrote:
> > So, my code has been running without flaw for quite some time now,
> > and thanks to the help of some folks here a few months back, I'm
> > learning more about matplotlib.  But today I hit a wall.
> >
> > Under matplotlib 0.91.2/Py2.5, I'm getting this graph:
> > http://joshuakugler.com/images/good_graph.png
> >.. .snip
> > No, I haven't assembled a minimal test case (this is quite a
> > complex system, I spent several hours on this thinking I had broken
> > my code until it occurred to me to run it on an old Py2.5/mpl
> > 0.91.2 setup), and no I haven't trolled the changelogs to see what
> > change in behavior I might have hit, but I was wondering if anyone
> > any ideas of what I need to be checking off the top of their heads.
>
> You are running a really old mpl -- the last 0.91 release was about
> 16 months ago.  If you want resolution against the latest tree, you
> will need to post an updated script exhibiting the problem.

I realize I was running an old MPL. Hmm...how does MPL define major 
releases?  I didn't think there would be API or functionality breakage 
going from 0.91 to 0.98.  So, does that mean if I update my program to 
run with 0.98, it will no longer work correctly under 0.91?

> > P.S. Oh, and there is also a nice traceback I'm getting on other
> > graphs that seems to be related to this glitch, but I'll wait until
> > I have the first glitch fixed as the second glitch may get fixed in
> > the process.
>
> Ahh, this is a tantalizing morsel. If only we had the traceback, we
> might be able to help...

Yeah, I know...but I didn't how related it was.  For those who care, 
here it is, but I haven't been able to track down what's causing it, 
other than somewhere along the line my start/end points are getting set 
to inf and my code isn't doing it.

Traceback (most recent call last):
  File "./photizo_legacy_graph.py", line 187, in <module>
    'graphs', out_filename ))
  
File "/home/jkugler/programming/photizo/trunk/photizo/legacy/BaseFigure.py", 
line 69, in createImage
    self.layout()
  
File "/home/jkugler/programming/photizo/trunk/photizo/legacy/GWSFigures.py", 
line 31, in layout
    graph1.plotDate()
  
File "/home/jkugler/programming/photizo/trunk/photizo/legacy/BaseGraph.py", 
line 400, in plotDate
    line = self.main_axes.plot_date(g[:,0], g[:,1])
  File "/usr/lib/python2.6/dist-packages/matplotlib/axes.py", line 3348, 
in plot_date
    self.xaxis_date(tz)
  File "/usr/lib/python2.6/dist-packages/matplotlib/axes.py", line 2175, 
in xaxis_date
    locator.refresh()
  File "/usr/lib/python2.6/dist-packages/matplotlib/dates.py", line 559, 
in refresh
    dmin, dmax = self.viewlim_to_dt()
  File "/usr/lib/python2.6/dist-packages/matplotlib/dates.py", line 454, 
in viewlim_to_dt
    return num2date(vmin, self.tz), num2date(vmax, self.tz)
  File "/usr/lib/python2.6/dist-packages/matplotlib/dates.py", line 249, 
in num2date
    if not cbook.iterable(x): return _from_ordinalf(x, tz)
  File "/usr/lib/python2.6/dist-packages/matplotlib/dates.py", line 169, 
in _from_ordinalf
    ix = int(x)
OverflowError: cannot convert float infinity to integer

-- 
Joshua Kugler
Part-Time System Admin/Programmer
http://www.eeinternet.com
PGP Key: http://pgp.mit.edu/  ID 0xDB26D7CE