Mailman 3 October 2015 - Matplotlib-users

Re: [Matplotlib-users] ImportError on Anaconda Win64 system
by Jonno Nov. 4, 2015

Nov. 4, 2015

I also get the same import error DLL load failed if I set the backend to WXAgg in matplotlibrc then try from pylab import * On Fri, Oct 30, 2015 at 7:50 AM, Jens Nielsen <jenshnielsen(a)gmail.com> wrote: > If that fails that is a bug in PyQt/Qt or in your anaconda installation > and not a Matplotlib bug. You could try reinstall QT and PyQt. > > As a workaround you can tell Matplotlib to use a different backend > http://matplotlib.org/faq/usage_faq.html#what-is-a-backend > > BTW the matplotlib mailing list has changed to matplotlib-users(a)python.org > . > > best > Jens > > fre. 30. okt. 2015 kl. 12.43 skrev Jonno <jonnojohnson(a)gmail.com>: > >> Traceback (most recent call last): >> File "<stdin>", line 1, in <module> >> ImportError: DLL load failed: The specified module could not be found. >> >> On Fri, Oct 30, 2015 at 2:26 AM, Jens Nielsen <jenshnielsen(a)gmail.com> >> wrote: >> >>> It sounds like your PyQt package is broken. >>> >>> What happens if you do: >>> >>> from PyQt4 import QtCore, QtGui >>> >>> in a python shell >>> >>> /Jens >>> >>> fre. 30. okt. 2015 kl. 03.06 skrev Jonno <jonnojohnson(a)gmail.com>: >>> >>>> Not sure where to post this. >>>> >>>> I have a fresh Anaconda Win64 python 2.7.10 install which I then >>>> updated using conda update --all. >>>> >>>> If it try to: >>>> from pylab import * >>>> I get the following: >>>> >>>> >>>> File "~\Anaconda\lib\site-packages\matplotlib\backends\qt_compat.py", >>>> line 91, in <module> >>>> from PyQt4 import QtCore, QtGui >>>> ImportError: DLL load failed: The specified module could not be found. >>>> >>>> >>>> I have the following installed: >>>> qt: 4.8.7 >>>> pyqt 4.11.4 >>>> matplotlib 1.4.3 >>>> >>>> Should I open an issue on matplotlib github? >>>> >>>> >>>> ------------------------------------------------------------------------------ >>>> _______________________________________________ >>>> Matplotlib-users mailing list >>>> Matplotlib-users(a)lists.sourceforge.net >>>> https://lists.sourceforge.net/lists/listinfo/matplotlib-users >>>> >>> >>

2 6

[announce] matplotlib 1.5.0 released
by Thomas Caswell Oct. 30, 2015

Oct. 30, 2015

Hey all, We are pleased to finally announce the release of matplotlib 1.5.0! It has been over a year since the last feature release and we have had over 230 people contribute to this cycle. This release of matplotlib has several major new features including - Auto-redraw using the object-oriented API in interactive mode. - Most plotting functions now support labeled data API [Jan Schulz]. - Color cycling has extended to all style properties [Ben Root]. - Four new perceptually uniform color maps, including the soon-to-be default 'viridis'. [Stefan van der Walt and Nathaniel Smith]. - More included style sheets. - Many small plotting improvements. - Proposed new framework for managing the GUI toolbar and tools. - Pixel-value on mouse over for imshow [Steven Silvester] For demos of some of these features in action see this notebook: https://gist.github.com/tacaswell/72b0d579aeb54d4fbf87 which is version of the talk I presented at scipy, pydata Seattle and pygotham this summer. There will be more in-depth demos of the new features coming. This release has a new required dependency, cycler <http://matplotlib.org/cycler> , for composing complex style cycles. In 1.5.0 we have dropped official support for python 2.6 and 3.3. The next matplotlib release will be the 2.0 default-style-only release, planned for 1-2 months from now. Tom

1 0

Problems with pip3 install of matplotlib-1.4.3
by psychemedia Oct. 29, 2015

Oct. 29, 2015

Trying to install matplotlib using: pip3 install matplotlib I'm getting the following issue which looks like it could be a python 3 incompatibility issue? #----------- Collecting matplotlib Downloading matplotlib-1.4.3.tar.gz (50.4MB) 100% |████████████████████████████████| 50.4MB 10.4MB/s Complete output from command python setup.py egg_info: Traceback (most recent call last): File "<string>", line 20, in <module> File "/tmp/pip-build-lgeaee7f/matplotlib/setup.py", line 155, in <module> result = package.check() File "/tmp/pip-build-lgeaee7f/matplotlib/setupext.py", line 1287, in check import pyparsing File "/usr/local/lib/python3.4/dist-packages/pyparsing.py", line 1557 print t ^ SyntaxError: Missing parentheses in call to 'print' ============================================================================ Edit setup.cfg to change the build options BUILDING MATPLOTLIB matplotlib: yes [1.4.3] python: yes [3.4.3 (default, Oct 14 2015, 20:33:09) [GCC 4.8.4]] platform: yes [linux] REQUIRED DEPENDENCIES AND EXTENSIONS numpy: yes [version 1.10.1] six: yes [using six version 1.10.0] dateutil: yes [using dateutil version 2.2] pytz: yes [using pytz version 2015.7] tornado: yes [using tornado version 4.2.1] ---------------------------------------- Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-build-lgeaee7f/matplotlib -- View this message in context: http://matplotlib.1069221.n5.nabble.com/Problems-with-pip3-install-of-matpl… Sent from the matplotlib - users mailing list archive at Nabble.com.

2 2

Re: [Matplotlib-users] updating contours
by Slavin, Jonathan Oct. 27, 2015

Oct. 27, 2015

Well I've come up with a better approach now: cs = ax.contour(...) then to update, just remove via: cs.collections[0].remove() and create new contours cs = ax.contour(...) Jon On Tue, Oct 27, 2015 at 9:49 AM, <matplotlib-users-request(a)python.org> wrote: > Do you think it's worthy of a bug report? It's not clear to me that the > collections of the AxesSubplot should be considered as internal, though I > do think that QuadContourSet objects should have a remove method in the > same way that AxesImage and Line2D objects have. > > Jon > > On Tue, Oct 27, 2015 at 9:06 AM, Thomas Caswell <tcaswell(a)gmail.com> > wrote: > > > That is a bug in something... > > > > On Tue, Oct 27, 2015, 08:53 Slavin, Jonathan <jslavin(a)cfa.harvard.edu> > > wrote: > > > >> Tom, > >> > >> Do you mean something like: > >> cs = ax.contour(...) > >> . > >> . > >> . > >> cs.remove() > >> If so, that doesn't work: > >> AttributeError: QuadContourSet instance has no attribute 'remove' > >> > >> Jon > >> > -- ________________________________________________________ Jonathan D. Slavin Harvard-Smithsonian CfA jslavin(a)cfa.harvard.edu 60 Garden Street, MS 83 phone: (617) 496-7981 Cambridge, MA 02138-1516 cell: (781) 363-0035 USA ________________________________________________________

1 0

Re: [Matplotlib-users] updating contours
by Slavin, Jonathan Oct. 27, 2015

Oct. 27, 2015

Do you think it's worthy of a bug report? It's not clear to me that the collections of the AxesSubplot should be considered as internal, though I do think that QuadContourSet objects should have a remove method in the same way that AxesImage and Line2D objects have. Jon On Tue, Oct 27, 2015 at 9:06 AM, Thomas Caswell <tcaswell(a)gmail.com> wrote: > That is a bug in something... > > On Tue, Oct 27, 2015, 08:53 Slavin, Jonathan <jslavin(a)cfa.harvard.edu> > wrote: > >> Tom, >> >> Do you mean something like: >> cs = ax.contour(...) >> . >> . >> . >> cs.remove() >> If so, that doesn't work: >> AttributeError: QuadContourSet instance has no attribute 'remove' >> >> Jon >> >> On Tue, Oct 27, 2015 at 7:48 AM, Thomas Caswell <tcaswell(a)gmail.com> >> wrote: >> >>> Please don't do ax.collections.pop(), it is better to keep a reference >>> to the object returned by contour and then using its remove method. >>> >>> The second way is safer as you will always remove the artist you think >>> you are removing and more future proof as the lists of artists (lines, >>> collections, ...) really should be considered internal details of mpl and >>> not accessed directly. >>> >>> Tom >>> >>> On Tue, Oct 27, 2015, 01:38 Slavin, Jonathan <jslavin(a)cfa.harvard.edu> >>> wrote: >>> >>>> Hi Mike, >>>> >>>> Yes, that's basically what I ended up doing. I did >>>> ax.collections.pop() >>>> ax.contour(...) >>>> >>>> I'm not sure if there's a different (better?) way to remove the >>>> contours, but that works. >>>> >>>> By the way, it was not easy to discover that contours are collections >>>> (a LineCollection), though I guess it's not too hard to guess. I think the >>>> docs could provide more information along these lines. >>>> >>>> Jon >>>> >>>> On Mon, Oct 26, 2015 at 11:07 AM, Michael Droettboom < >>>> mdroettboom(a)continuum.io> wrote: >>>> >>>>> You're correct that there is no equivalent -- contour is one of those >>>>> "computed" things that can't be directly updated from the original data. >>>>> You don't need to do a whole `cla()` though. Removing the contour artist >>>>> and calling contour again should be sufficient. >>>>> >>>>> Mike >>>>> >>>>> On Fri, Oct 23, 2015 at 11:56 AM, Slavin, Jonathan < >>>>> jslavin(a)cfa.harvard.edu> wrote: >>>>> >>>>>> Hi, >>>>>> >>>>>> I'm looking at a series of images and want to include overplotted >>>>>> contours. To update the image I just need to use the set_data() method of >>>>>> the AxesImage object. However, as far as I can tell, there's nothing >>>>>> similar for the QuadContourSet object. I tried set_array() but that didn't >>>>>> work. Am I missing something? Does anyone have any suggestions for how to >>>>>> update the contours? Of course if necessary I could do a cla(), but that >>>>>> would be slow, I think. >>>>>> >>>>>> Regards, >>>>>> Jon >>>>>> -- >>>>>> ________________________________________________________ >>>>>> Jonathan D. Slavin Harvard-Smithsonian CfA >>>>>> jslavin(a)cfa.harvard.edu 60 Garden Street, MS 83 >>>>>> phone: (617) 496-7981 Cambridge, MA 02138-1516 >>>>>> cell: (781) 363-0035 USA >>>>>> ________________________________________________________ >>>>>> >>>>>> >>>>>> _______________________________________________ >>>>>> Matplotlib-users mailing list >>>>>> Matplotlib-users(a)python.org >>>>>> https://mail.python.org/mailman/listinfo/matplotlib-users >>>>>> >>>>>> >>>>> >>>>> >>>>> -- >>>>> Michael Droettboom >>>>> Continuum Analytics >>>>> >>>> >>>> >>>> >>>> -- >>>> ________________________________________________________ >>>> Jonathan D. Slavin Harvard-Smithsonian CfA >>>> jslavin(a)cfa.harvard.edu 60 Garden Street, MS 83 >>>> phone: (617) 496-7981 Cambridge, MA 02138-1516 >>>> cell: (781) 363-0035 USA >>>> ________________________________________________________ >>>> >>>> _______________________________________________ >>>> Matplotlib-users mailing list >>>> Matplotlib-users(a)python.org >>>> https://mail.python.org/mailman/listinfo/matplotlib-users >>>> >>> >> >> >> -- >> ________________________________________________________ >> Jonathan D. Slavin Harvard-Smithsonian CfA >> jslavin(a)cfa.harvard.edu 60 Garden Street, MS 83 >> phone: (617) 496-7981 Cambridge, MA 02138-1516 >> cell: (781) 363-0035 USA >> ________________________________________________________ >> >> -- ________________________________________________________ Jonathan D. Slavin Harvard-Smithsonian CfA jslavin(a)cfa.harvard.edu 60 Garden Street, MS 83 phone: (617) 496-7981 Cambridge, MA 02138-1516 cell: (781) 363-0035 USA ________________________________________________________

2 1

updating contours
by Slavin, Jonathan Oct. 27, 2015

Oct. 27, 2015

Hi, I'm looking at a series of images and want to include overplotted contours. To update the image I just need to use the set_data() method of the AxesImage object. However, as far as I can tell, there's nothing similar for the QuadContourSet object. I tried set_array() but that didn't work. Am I missing something? Does anyone have any suggestions for how to update the contours? Of course if necessary I could do a cla(), but that would be slow, I think. Regards, Jon -- ________________________________________________________ Jonathan D. Slavin Harvard-Smithsonian CfA jslavin(a)cfa.harvard.edu 60 Garden Street, MS 83 phone: (617) 496-7981 Cambridge, MA 02138-1516 cell: (781) 363-0035 USA ________________________________________________________

4 4

Quiverkey
by Kyle Shores Oct. 26, 2015

Oct. 26, 2015

Hello, I’ve recently been making many plots using the plot.quiver. Quiver works extremely well, but the quiverkey reference arrow is having 2 issues. Either it doesn’t display, or it doesn’t display until I resize the the figure window that is generated. I would like to point out that if there is ever quiver plot that is inside of a grid spec instance that it has never (not even once) displayed the reference arrow in the plot. Do you know how this might be fixed? If you would like, I can provide two examples to better illustrate this. Thanks, Kyle Shores Texas A&M ‘18

2 1

problems with search on the web page
by Slavin, Jonathan Oct. 26, 2015

Oct. 26, 2015

Hi, For a while now I've been having problems with searching on the matplotlib web page. Specifically, terms that should produce results in a search come up empty. Attached is a screenshot illustrating how typing 'codex contour' in the search box comes up empty though, obviously there are several code examples using contour. Anyone know what the problem is? Regards, Jon -- ________________________________________________________ Jonathan D. Slavin Harvard-Smithsonian CfA jslavin(a)cfa.harvard.edu 60 Garden Street, MS 83 phone: (617) 496-7981 Cambridge, MA 02138-1516 cell: (781) 363-0035 USA ________________________________________________________

1 0

grid_locator2 problem in polar plot
by Martinho Marta-Almeida Oct. 20, 2015

Oct. 20, 2015

Hello I am trying to change ticks in vertical axis of a Q1 polar plot. But ticks are placed with some angle hard to understand... How can I fix this!? code and fig follow attached thanks mm

1 0

duplicating a line object
by Slavin, Jonathan Oct. 16, 2015

Oct. 16, 2015

Hi, I have a plot on which I want to plot many points as open circles. I also want to include a legend. The problem is that while a thin marker edge width works very nicely for the plot, it is difficult to see in the legend. My solution, which does work, is to define Line2D objects as proxy artists and keep all the attributes the same except the mew, which I increase. However, this seems error prone: if one changes attributes of the line, then one has to also make those same changes to the proxy artist line. I thought a better solution was to create the proxy artist as a duplicate (copy) of the line and then change the mew via line.set_mew(n). However, I haven't been able to figure out how to duplicate a Line2D object. I tried copy and deepcopy from the python builtin copy module, but those didn't work. Any help on this (including alternative ways of approaching the problem) would be appreciated. Thanks, Jon -- ________________________________________________________ Jonathan D. Slavin Harvard-Smithsonian CfA jslavin(a)cfa.harvard.edu 60 Garden Street, MS 83 phone: (617) 496-7981 Cambridge, MA 02138-1516 cell: (781) 363-0035 USA ________________________________________________________

2 2