Mailman 3 June 2017 - Matplotlib-devel

step-by-step to installling from source using conda?
by Jody Klymak Aug. 7, 2017

Aug. 7, 2017

Hi all, I’m somewhat stymied trying to understand how to install matplotlib in a development environment using conda. I have MacOS, and I have brew gcc etc. I know how to set up a env in conda. I eventually want to be able to run the tests, so that I can stop uploading things with PEP8 errors etc. Sorry if this is too vague. I can start over again and send specific errors if that is easier, but I would bet someone has a step-by-step. Thanks, Jody

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Matplotlib Finance Maintenance
by dmcnick150＠frontier.com Aug. 5, 2017

Aug. 5, 2017

Hello! What is involved in maintaining the matplotlib.finance module? I am a daily user of the module and consider myself to be an okay Python script writer, but I wonder if maintaining the module is beyond my skill. Thanks for your consideration, David McNickle dmcnick150(a)frontier.com Sent from myMail for iOS

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A (new) cairo backend for matplotlib
by Antony Lee June 29, 2017

June 29, 2017

Hi all, Following my frustration with the somewhat incomprehensible (... to me) Agg backend codebase, and as recently mentioned on the gitter channel, I have hacked together a mostly complete native cairo backend for matplotlib. See https://github.com/anntzer/mpl_cairo (which also lists the missing features that I can see). It is based on pybind11 and requires a C++ compiler with C++17 support (e.g., GCC 7.1). One of the original motivations was to get rid of the "inaccurate marker stamping" issue (https://github.com/matplotlib/matplotlib/issues/7262, https://github.com/matplotlib/matplotlib/issues/7233). Yes, I could have tried to revert the original patch too... The repository contains a few examples where the new cairo backend places markers much more accurately. Removing that optimization means that the backend is a bit slower than Agg for drawing markers (though not more than ~1.5x); for other tasks it appears to be nearly as fast. It is dramatically faster than the current (somewhat buggy) pycairo/cairocffi-based cairo backend (gtk3cairo, and qt5cairo with https://github.com/matplotlib/matplotlib/pull/8771). Being a native backend allows us to directly call libraries such as freetype (bypassing -- in part -- the longstanding suggestion that ft2font needs to be rewritten); it should likewise be possible to support complex text layout (http://matplotlib.org/devel/MEP/MEP14.html) with the appropriate library (from a quick search, https://github.com/HOST-Oman/libraqm seems to be an interesting possibility). Additionally, cairo itself has an OpenGL (cairo-gl) backend, which we may look into (currently, the cairo calls go into an image buffer which is then picked up by the GUI toolkit for display; the idea would be to instead use the cairo-gl backend to directly render to the display). I am not making a PR out of this backend *yet* mostly due to the dependency on a very recent compiler, which I believe would not be acceptable to many, and would probably require delving into the build scripts. Note that even if I remove the C++17-isms from the codebase (which I'd rather not do -- "auto [x, y] = ..." is quite nice), pybind11 requires C++11 and suggests using a C++14 compiler. Additionally, the backend depends on a number of other large (current) PRs which do not seem close to get in (as listed in the README). But I'd appreciate if you give it a try and give me some feedback. Antony

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Documentation: only building one tutorial...
by Jody Klymak June 13, 2017

June 13, 2017

Hi all, I think I asked this before last time I contributed to the tutorials, but is there some way to just build the docs of one tutorial at a time as I edit? Thanks, Jody

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added lgtm PR integration
by Thomas Caswell June 8, 2017

June 8, 2017

Folks, I added PR integration for https://lgtm.com/projects/g/matplotlib/matplotlib/ . We have had two PRs based on issues this service, lets give it a whirl as a CI. Tom

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ylabels offset in box and whisker plots
by Isaac Gerg June 6, 2017

June 6, 2017

Any idea why this is happening? Code... # Boxplot plt.clf() fig = matplotlib.pyplot.gcf() fig.set_size_inches(9,16) plt.rc('lines', **{'marker':None}) plt.grid(True) data = r.copy()/100 data = np.log10(data) data[np.isinf(data)] = np.nan idx = np.nanmedian(data.T, axis=0).argsort() data = data[idx, :] newGenii = [] z = [] for k in idx: newGenii.append(genii[k]) for k in range(data.shape[0]): tmp = data.T[:,k] tmp = tmp[np.isfinite(tmp)] z.append(tmp) plt.boxplot(z, notch = False, vert = False, whis=[5,95], sym='') plt.yticks(np.arange(data.shape[0]), newGenii, size='xx-small') plt.xlabel('Log10 Abundance') plt.title('Genus -- Box and Whisker') plt.savefig(os.path.join(baseDir, 'box and whisker.png')) plt.close('all') [image: Inline image 1]

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weekly meeting
by Eric Firing June 5, 2017

June 5, 2017

Participants were Paul Hobson and myself. We discussed and merged one PR, at which point github went down, so we ended the meeting. (The github outage turned out to be brief.) Eric

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