[Matplotlib-users] BUG: RuntimeError: dictionary changed size during iteration
Hello everyone, in my program I'm encountering an error when calling the function axes.set_xticks (Matplotlib 1.2.0 on python 2.7-64 bit). It is really difficult for me to build a test case, because my program is really complex. Here is the error traceback: File "C:\Python27\Lib\site-packages\matplotlib\axes.py", line 2596, in set_xticks return self.xaxis.set_ticks(ticks, minor=minor) File "C:\Python27\Lib\site-packages\matplotlib\axis.py", line 1489, in set_ticks self.set_view_interval(min(ticks), max(ticks)) File "C:\Python27\Lib\site-packages\matplotlib\axis.py", line 1771, in set_view_interval max(vmin, vmax, Vmax)) File "C:\Python27\Lib\site-packages\matplotlib\transforms.py", line 932, in _set_intervalx self.invalidate() File "C:\Python27\Lib\site-packages\matplotlib\transforms.py", line 131, in invalidate return self._invalidate_internal(value, invalidating_node=self) File "C:\Python27\Lib\site-packages\matplotlib\transforms.py", line 155, in _invalidate_internal invalidating_node=self) File "C:\Python27\Lib\site-packages\matplotlib\transforms.py", line 155, in _invalidate_internal invalidating_node=self) File "C:\Python27\Lib\site-packages\matplotlib\transforms.py", line 155, in _invalidate_internal invalidating_node=self) File "C:\Python27\Lib\site-packages\matplotlib\transforms.py", line 2141, in _invalidate_internal invalidating_node=invalidating_node) File "C:\Python27\Lib\site-packages\matplotlib\transforms.py", line 155, in _invalidate_internal invalidating_node=self) File "C:\Python27\Lib\site-packages\matplotlib\transforms.py", line 2141, in _invalidate_internal invalidating_node=invalidating_node) File "C:\Python27\Lib\site-packages\matplotlib\transforms.py", line 153, in _invalidate_internal for parent in self._parents.itervalues(): File "C:\Python27\Lib\weakref.py", line 147, in itervalues for wr in self.data.itervalues(): RuntimeError: dictionary changed size during iteration I googled and found that this is a well known bug due to the use of self.data.itervalues() in the for loop (i think the correct syntax should be for wr in iter(self.data.items()). So I would like to point out the bug (if it is) to the matplotlib guys, how can I do it? In the meantime, how can I work around it without changing the source code? Thanks in advance! -- Master Visual Studio, SharePoint, SQL, ASP.NET, C# 2012, HTML5, CSS, MVC, Windows 8 Apps, JavaScript and much more. Keep your skills current with LearnDevNow - 3,200 step-by-step video tutorials by Microsoft MVPs and experts. ON SALE this month only -- learn more at: http://p.sf.net/sfu/learnnow-d2d___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] plotting 3d function
On Mon, Jan 21, 2013 at 8:06 PM, Pau wrote: > Hi, > > I am somehow new to matplotlib and I am trying to plot this function of x > ,y ,z > > F(x,y,z)= > 38244.74787*Pi*(x^2+y^2+z^2)^.125+1615.975261*Pi*z^2/(x^2+y^2+z^2)^.875-1292.780210*Pi*z^2/((x^2+y^2+z^2)^.875*(1+y^2/x^2))+1292.78*Pi*(x^2+y^2+z^2)^.125/(1+y^2/x^2) > > in a similar way as > > http://matplotlib.org/mpl_examples/mplot3d/contour3d_demo3.hires.png > > The code is > http://matplotlib.org/mpl_examples/mplot3d/contour3d_demo3.py > > But I have no idea where to start... > > some help would be appreciated... > > thanks > > The reason you are having difficulty coming up with a way to plot this is because you have 3 input dimensions, and 1 output dimension that you wish to plot. If you were to plot this in 3D space, it would have to be done as F(x,y,z) as a colored "mist" in the domain of (x,y,z). While a "mist" can't be done in mplot3d, you could plot out scatter points to emulate this. One could also use contourf3d(..., zdir='z', offset=...) to create slices of the filled contours, similar to this example: http://matplotlib.org/examples/mplot3d/contourf3d_demo2.html Now, if the domain of (x,y,z) can be parameterized as a surface (i.e., a sphere or a cylinder), then you are looking to do an image of F(x,y,z) plotted on that surface, which is a little bit difficult, but also do-able using the plot_surface() function. Cheers! Ben Root -- Master Visual Studio, SharePoint, SQL, ASP.NET, C# 2012, HTML5, CSS, MVC, Windows 8 Apps, JavaScript and much more. Keep your skills current with LearnDevNow - 3,200 step-by-step video tutorials by Microsoft MVPs and experts. ON SALE this month only -- learn more at: http://p.sf.net/sfu/learnnow-d2d___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
[Matplotlib-users] Hiding labels in a legend?
Hello- Prior to version 1.2 of MPL I was able to hide labels for certain lines in the legend by setting the label=None when plotting a line, however in 1.2 it is now showing the legend entry and visibly printing "None". Is there a workaround to hide the label? Thanks, David -- Master Visual Studio, SharePoint, SQL, ASP.NET, C# 2012, HTML5, CSS, MVC, Windows 8 Apps, JavaScript and much more. Keep your skills current with LearnDevNow - 3,200 step-by-step video tutorials by Microsoft MVPs and experts. ON SALE this month only -- learn more at: http://p.sf.net/sfu/learnnow-d2d ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
[Matplotlib-users] twiny and title
Hi, I'm having some trouble with using twiny and a title on the plot. The title is writing over the axis label -- and even the tick labels. I've tried tight_layout() but it doesn't seem to help. I could use fig.text instead of title and place the title text where I want it (with a bit of fiddling), but it'd be nice to have a more elegant solution. Jon -- __ Jonathan D. Slavin Harvard-Smithsonian CfA jsla...@cfa.harvard.edu 60 Garden Street, MS 83 phone: (617) 496-7981 Cambridge, MA 02138-1516 cell: (781) 363-0035 USA __ -- Master Visual Studio, SharePoint, SQL, ASP.NET, C# 2012, HTML5, CSS, MVC, Windows 8 Apps, JavaScript and much more. Keep your skills current with LearnDevNow - 3,200 step-by-step video tutorials by Microsoft MVPs and experts. ON SALE this month only -- learn more at: http://p.sf.net/sfu/learnnow-d2d ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] twiny and title
On Tue, Jan 22, 2013 at 12:22 PM, Jonathan Slavin
wrote:
> Hi,
>
> I'm having some trouble with using twiny and a title on the plot. The
> title is writing over the axis label -- and even the tick labels. I've
> tried tight_layout() but it doesn't seem to help. I could use fig.text
> instead of title and place the title text where I want it (with a bit of
> fiddling), but it'd be nice to have a more elegant solution.
>
Try this is a workaround:
fig, ax1 = plt.subplots()
ax2 = ax1.twiny()
ax1.plot(np.random.randn(50), 'gs')
ax2.plot(np.random.randn(50), 'bo')
ax1.set_title('Test Title')
ax2.xaxis.tick_bottom()
plt.show()
Does that help?
-paul
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Re: [Matplotlib-users] twiny and title
Hi Paul,
This doesn't solve my problem since the whole point was to have two
separate x axes with different scales, etc. One thing that I found that
does help is to use the suptitle() method of figure. This at least puts
the title at the top of the figure and I can then fiddle with the top
offset for the subplot to get the title to not overlap the axis label.
Jon
On Tue, 2013-01-22 at 13:02 -0800, Paul Hobson wrote:
>
> On Tue, Jan 22, 2013 at 12:22 PM, Jonathan Slavin
> wrote:
> Hi,
>
> I'm having some trouble with using twiny and a title on the
> plot. The
> title is writing over the axis label -- and even the tick
> labels. I've
> tried tight_layout() but it doesn't seem to help. I could use
> fig.text
> instead of title and place the title text where I want it
> (with a bit of
> fiddling), but it'd be nice to have a more elegant solution.
>
>
> Try this is a workaround:
> fig, ax1 = plt.subplots()
> ax2 = ax1.twiny()
> ax1.plot(np.random.randn(50), 'gs')
> ax2.plot(np.random.randn(50), 'bo')
> ax1.set_title('Test Title')
> ax2.xaxis.tick_bottom()
> plt.show()
>
> Does that help?
> -paul
>
>
--
__
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phone: (617) 496-7981 Cambridge, MA 02138-1516
cell: (781) 363-0035 USA
__
--
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Re: [Matplotlib-users] Hiding labels in a legend?
On Tue, Jan 22, 2013 at 1:57 PM, David Erickson wrote: > Hello- > Prior to version 1.2 of MPL I was able to hide labels for certain > lines in the legend by setting the label=None when plotting a line, > however in 1.2 it is now showing the legend entry and visibly printing > "None". Is there a workaround to hide the label? > > Thanks, > David > > I think you want "_nolegend_" for those labels. The hiding of the labels for None was an undocumented feature, I think, and has been "fixed". http://matplotlib.org/api/axes_api.html#matplotlib.axes.Axes.legend Cheers! Ben Root -- Master Visual Studio, SharePoint, SQL, ASP.NET, C# 2012, HTML5, CSS, MVC, Windows 8 Apps, JavaScript and much more. Keep your skills current with LearnDevNow - 3,200 step-by-step video tutorials by Microsoft MVPs and experts. ON SALE this month only -- learn more at: http://p.sf.net/sfu/learnnow-d2d___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Hiding labels in a legend?
On Tue, Jan 22, 2013 at 1:20 PM, Benjamin Root wrote: > > > On Tue, Jan 22, 2013 at 1:57 PM, David Erickson > wrote: >> >> Hello- >> Prior to version 1.2 of MPL I was able to hide labels for certain >> lines in the legend by setting the label=None when plotting a line, >> however in 1.2 it is now showing the legend entry and visibly printing >> "None". Is there a workaround to hide the label? >> >> Thanks, >> David >> > > I think you want "_nolegend_" for those labels. The hiding of the labels > for None was an undocumented feature, I think, and has been "fixed". > > http://matplotlib.org/api/axes_api.html#matplotlib.axes.Axes.legend > Perfect, thanks Ben! -David -- Master Visual Studio, SharePoint, SQL, ASP.NET, C# 2012, HTML5, CSS, MVC, Windows 8 Apps, JavaScript and much more. Keep your skills current with LearnDevNow - 3,200 step-by-step video tutorials by Microsoft MVPs and experts. ON SALE this month only -- learn more at: http://p.sf.net/sfu/learnnow-d2d ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Hiding labels in a legend?
I have to say I disagree with this "fix". None was a nice, very intuitive way to hide the label. Many Python systems use None in that kind of role and I really doubt anyone is going to use None when they meant "None" so converting it to a string seems like a bad idea. Ted From: David Erickson [halcyon1...@gmail.com] Sent: Tuesday, January 22, 2013 4:47 PM To: Benjamin Root Cc: matplotlib-users@lists.sourceforge.net Subject: Re: [Matplotlib-users] Hiding labels in a legend? On Tue, Jan 22, 2013 at 1:20 PM, Benjamin Root wrote: > > > On Tue, Jan 22, 2013 at 1:57 PM, David Erickson > wrote: >> >> Hello- >> Prior to version 1.2 of MPL I was able to hide labels for certain >> lines in the legend by setting the label=None when plotting a line, >> however in 1.2 it is now showing the legend entry and visibly printing >> "None". Is there a workaround to hide the label? >> >> Thanks, >> David >> > > I think you want "_nolegend_" for those labels. The hiding of the labels > for None was an undocumented feature, I think, and has been "fixed". > > http://matplotlib.org/api/axes_api.html#matplotlib.axes.Axes.legend > Perfect, thanks Ben! -David -- Master Visual Studio, SharePoint, SQL, ASP.NET, C# 2012, HTML5, CSS, MVC, Windows 8 Apps, JavaScript and much more. Keep your skills current with LearnDevNow - 3,200 step-by-step video tutorials by Microsoft MVPs and experts. ON SALE this month only -- learn more at: http://p.sf.net/sfu/learnnow-d2d ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users -- Master Visual Studio, SharePoint, SQL, ASP.NET, C# 2012, HTML5, CSS, MVC, Windows 8 Apps, JavaScript and much more. Keep your skills current with LearnDevNow - 3,200 step-by-step video tutorials by Microsoft MVPs and experts. ON SALE this month only -- learn more at: http://p.sf.net/sfu/learnnow-d2d ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Hiding labels in a legend?
On Tue, Jan 22, 2013 at 9:10 PM, Drain, Theodore R (343P) <
theodore.r.dr...@jpl.nasa.gov> wrote:
> I have to say I disagree with this "fix". None was a nice, very intuitive
> way to hide the label. Many Python systems use None in that kind of role
> and I really doubt anyone is going to use None when they meant "None" so
> converting it to a string seems like a bad idea.
>
> Ted
>
>
IIRC, the problem is that in matplotlib, the python None has a special
meaning in most places ("do the default thing"). Legends, by default, will
create default labels. For some time, we were capable of distinguishing
when someone submitted label=None and didn't state anything at all for
labels. This often causes confusion down the draw stack, and we have been
working towards getting rid of such distinctions.
Of course, this is all from memory, which is notoriously bad. If someone
else can bisect the commit that changed this, maybe that can refresh my
memory and maybe I could see a reason to re-instate this behavior. Also,
if anyone can spot where it is stated in the documentation or examples that
None acts the same as "_nolegend_", then we can consider this a regression
and get it fixed.
Cheers!
Ben Root
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Re: [Matplotlib-users] Hiding labels in a legend?
On Jan 22, 2013, at 7:01PM, Benjamin Root wrote:
>
>
> On Tue, Jan 22, 2013 at 9:10 PM, Drain, Theodore R (343P)
> wrote:
> I have to say I disagree with this "fix". None was a nice, very intuitive
> way to hide the label. Many Python systems use None in that kind of role and
> I really doubt anyone is going to use None when they meant "None" so
> converting it to a string seems like a bad idea.
>
> Ted
>
>
> IIRC, the problem is that in matplotlib, the python None has a special
> meaning in most places ("do the default thing"). Legends, by default, will
> create default labels. For some time, we were capable of distinguishing when
> someone submitted label=None and didn't state anything at all for labels.
> This often causes confusion down the draw stack, and we have been working
> towards getting rid of such distinctions.
>
> Of course, this is all from memory, which is notoriously bad. If someone
> else can bisect the commit that changed this, maybe that can refresh my
> memory and maybe I could see a reason to re-instate this behavior. Also, if
> anyone can spot where it is stated in the documentation or examples that None
> acts the same as "_nolegend_", then we can consider this a regression and get
> it fixed.
>
> Cheers!
> Ben Root
If None means do the default thing, then great. I always interpreted the
default for a plot command (line, patch, scatter, bar, etc.) to be no legend
entry, unless explicitly given. While not the specification as you have given
it (default is default labels), this is my working specification (I have not
yet migrated to 1.2.0).
Cheers,
Sterling
PS Notwithstanding this possible point of difference of opinion, I think the
matplotlib team is awesome, and puts out a great product. So I am willing to
concede the point if no reversion is made.
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