Mailman 3 October 2016 - Matplotlib-users

Version issue
by Rohan Bhojannawar Jan. 29, 2017

Jan. 29, 2017

I'm using OpenCV with Ubuntu 16.04 My matplotlib is installed only in python 2.7. What do you suggest I do for me to use the same library with another version of python viz. python 3.5 installed in my system ? My .py files run if properly using matplotlib if I type python2.7 instead of python3 in terminal. Kindly suggest.

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Spines and styles
by Juan Nunez-Iglesias Oct. 31, 2016

Oct. 31, 2016

Hi all, Is there a way to remove the top and right axis spines in a Matplotlib Style file? Thanks, Juan.

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MEP28 (Draft) Boxplots Enhancements and Simplifications
by Paul Hobson Oct. 23, 2016

Oct. 23, 2016

Hello everyone, We are soliciting feedback and comments on a new MEP (#28) proposing some high-level changes to the boxplot API has been released in *draft* form here: http://matplotlib.org/devdocs/devel/MEP/MEP28.html The goals of the MEP are as follows: 1) Deprecate and remove seldom used*, difficult-to-use, and redundant** kwargs 2) Synchronize parameter names between `boxplot` and `bxp` 3a) Allow user-defined pre- and post-stat calculation data transformation functions to `boxplot` OR 3b) Allow users to pass their own statistics function (with parameters) to ` boxplot` The functionality of #3a/3b is currently available to users if they go through the `bxp` function instead of the `boxplot` function. However, this isn't much help for users of downstream libraries like pandas and seaborn. The goal of #3 in general is to allow the following in e.g., seaborn: import seaborn tips = seaborn.load_data('tips')g = seaborn.factorplot(x="day", y="total_bill", hue="sex", data=tips, kind='box', palette="PRGn", shownotches=True, statfxn=my_box_stats, bootstrap_method='BCA', whisker_method='dynamic') This kind of flexibility would also be available under the current pandas API. This MEP is very much still a draft and has not been accepted. If you have opinions about the proposed changes (positive or negative) we're all ears. -Paul H. * It is our perception that the usermedians and conf_intervals parameters don't get much use and are fairly difficult use. Additionally, the logic that handles and validates them is quite complex and difficult to maintain. ** The sym parameter is redundant with the flierprops parameter, which has been around for a few releases now. The code that reconciles the default marker style with both of these inputs is also complex and difficult to maintain.

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Unable to display data using matplotlib
by ashwinD12 . Oct. 14, 2016

Oct. 14, 2016

Hello, I am using this example from this cookbook - http://nbviewer.jupyter.org/github/unidata/notebook-gallery/blob/master/not… and I get this exception when I run it - I am wondering whether I need to matplotlib.use('Tkagg') which I did add but does not fix the problem. File "/usr/lib/python3/dist-packages/matplotlib/backends/backend_agg.py", line 474, in draw self.figure.draw(self.renderer)File "/usr/lib/python3/dist-packages/matplotlib/artist.py", line 61, in draw_wrapper draw(artist, renderer, *args, **kwargs)File "/usr/lib/python3/dist-packages/matplotlib/figure.py", line 1159, in draw func(*args) File "/usr/lib/python3/dist-packages/matplotlib/artist.py", line 61, in draw_wrapper draw(artist, renderer, *args, **kwargs) File "/usr/local/lib/python3.5/dist-packages/cartopy/mpl/geoaxes.py", line 355, in draw inframe=inframe)File "/usr/lib/python3/dist-packages/matplotlib/artist.py", line 61, in draw_wrapper draw(artist, renderer, *args, **kwargs)File "/usr/lib/python3/dist-packages/matplotlib/axes/_base.py", line 2324, in draw a.draw(renderer)File "/usr/lib/python3/dist-packages/matplotlib/artist.py", line 61, in draw_wrapper draw(artist, renderer, *args, **kwargs) File "/usr/local/lib/python3.5/dist-packages/cartopy/mpl/feature_artist.py", line 103, in draw geoms = self._feature.intersecting_geometries(extent)File "/usr/local/lib/python3.5/dist-packages/cartopy/feature.py", line 113, in intersecting_geometriesreturn (geom for geom in self.geometries() if File "/usr/local/lib/python3.5/dist-packages/cartopy/feature.py", line 180, in geometries name=self.name) File "/usr/local/lib/python3.5/dist-packages/cartopy/io/shapereader.py", line 246, in natural_earthreturn ne_downloader.path(format_dict)File "/usr/local/lib/python3.5/dist-packages/cartopy/io/__init__.py", line 223, in path result_path = self.acquire_resource(target_path, format_dict)File "/usr/local/lib/python3.5/dist-packages/cartopy/io/shapereader.py", line 301, in acquire_resource shapefile_online = self._urlopen(url)File "/usr/local/lib/python3.5/dist-packages/cartopy/io/__init__.py", line 262, in _urlopenreturn urlopen(url)File "/usr/lib/python3.5/urllib/request.py", line 163, in urlopenreturn opener.open(url, data, timeout)File "/usr/lib/python3.5/urllib/request.py", line 472, in open response = meth(req, response)File "/usr/lib/python3.5/urllib/request.py", line 582, in http_response'http', request, response, code, msg, hdrs)File "/usr/lib/python3.5/urllib/request.py", line 504, in error result = self._call_chain(*args)File "/usr/lib/python3.5/urllib/request.py", line 444, in _call_chain result = func(*args)File "/usr/lib/python3.5/urllib/request.py", line 696, in http_error_302return self.parent.open(new, timeout=req.timeout)File "/usr/lib/python3.5/urllib/request.py", line 472, in open response = meth(req, response) File "/usr/lib/python3.5/urllib/request.py", line 582, in http_response'http', request, response, code, msg, hdrs) File "/usr/lib/python3.5/urllib/request.py", line 510, in errorreturn self._call_chain(*args)File "/usr/lib/python3.5/urllib/request.py", line 444, in _call_chain result = func(*args) File "/usr/lib/python3.5/urllib/request.py", line 590, in http_error_default raise HTTPError(req.full_url, code, msg, hdrs, fp) urllib.error.HTTPError: HTTP Error 404: Not FoundTraceback (most recent call last): File "tempAdv.py", line 72, in <module> plt.show() File "/usr/lib/python3/dist-packages/matplotlib/pyplot.py", line 244, in showreturn _show(*args, **kw) File "/usr/lib/python3/dist-packages/matplotlib/backend_bases.py", line 192, in __call__ self.mainloop() File "/usr/lib/python3/dist-packages/matplotlib/backends/backend_tkagg.py", line 74, in mainloop Tk.mainloop() File "/usr/lib/python3.5/tkinter/__init__.py", line 408, in mainloop _default_root.tk.mainloop(n) AttributeError: 'NoneType' object has no attribute 'tk

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axes.hist() with 2D input
by Poughon Victor Oct. 7, 2016

Oct. 7, 2016

Hi, Working with images as 2D numpy arrays, it's very confusing to find that: plt.hist(image.flatten()) plt.hist(image) produce such different histograms. What I am expecting is the first one, which is the histogram of the image. But if I forget to flatten the array (which I don't need to do if I use numpy.histogram and then plot, adding to the confusion), the plotted histogram is strange. The number of bins is different, and so are the frequencies. I'm not sure what the point of this message is, but I'd like to share my experience with this. I just spend a good 30 minutes trying to understand why the matplotlib histogram of my image was clearly wrong. The pyplot.hist and axes.hist documentation are not so great in explaining what is plotted with 2D input (I'm still not sure what I'm looking at), or at building an expectation that if you are working with an image, plt.hist(image) is NOT what you want. To sum up, numpy.histogram and matplotlib's hist() have VERY different behaviors for 2D input arrays. numpy flattens, and matplotlib does... what exactly? Any thoughts? cheers, Victor Poughon

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encoders for animations
by Eric Firing Oct. 1, 2016

Oct. 1, 2016

For making video files the animation module presently supports ffmpeg (the default), avconv (a fork of ffmpeg), and mencoder. Does anyone use mencoder? If so, why? And would you be seriously inconvenienced or otherwise harmed if we ended our only partially successful support of mencoder as an option in the animation module? Thank you. Eric

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