Mailman 3 May 2016 - Matplotlib-users

mouse cursor coordinates
by grivet June 7, 2016

June 7, 2016

Hello, I want to retrieve the mouse cursor coordinates when i click inside a figure. I have tried a variety ef example programs, such as from pylab import * fig = plt.figure() ax = fig.add_subplot(111) ax.plot(np.random.rand(10)) def onclick(event): print("button=%d, x=%d, y=%d, xdata=%f, ydata=%f" %( event.button, event.x, event.y, event.xdata, event.ydata)) cid = fig.canvas.mpl_connect('button_press_event', onclick) ax.set_title("click on figure") show() The figure gets plotted, then nothing happens: the program simply ends and focus retruns to the IPython console. I am using distribution Anaconda/Python35/Spyder under Win7-64. What did I miss ? Thank you for your help, JP Grivet

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bug in double subscript LaTeX?
by Neal Becker May 27, 2016

May 27, 2016

The following test code doesn't render the _1 and _2 as double subscript. Is this a bug? import matplotlib.pyplot as plt esno1dB = 10; esno2dB=10 plt.suptitle (r'${E_s/N_0}_1=%g, {E_s/N_0}_2=%g$'%(esno1dB,esno2dB)) plt.show()

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REL: mpl v1.5.2rc2
by Thomas Caswell May 27, 2016

May 27, 2016

Folks, The second release candidate for 1.5.2 has been tagged. conda binaries are available via conda install -c conda-forge/channel/rc matplotlib -c conda-forge on all platforms. Tom

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How to register custom font (from ttf) with matplotlib
by Duncan Macleod May 20, 2016

May 20, 2016

Hi all, I have a custom font file (ttf) I would like to use with matplotlib. I don't have sudo access, so can't just add it to the standard fonts directory, but would like to add it to matplotlib's list of known fonts. I know that I can do something like this for one-off uses: from matplotlib import font_manager fp = font_manager.FontProperties(fname='myfont.ttf') fig = pyplot.figure() ax = fig.gca() ax.plot([1, 2, 3, 4, 5]) ax.set_xlabel('X-axis label', fontproperties=fp) But I would like to use the font as the default for all text objects in my figure. I have tried using rcParams: rcParams['font.family'] = fp.get_family() rcParams['font.sans-serif'] = fp.get_name() but I get the standard warning: UserWarning: findfont: Font family [u'sans-serif'] not found. Falling back to Bitstream Vera Sans and it uses the default font, even after blowing away my fontList.cache file (many times). I suspect that I have loaded the font using the FontProperties object, but haven't actually 'registered' it with matplotlib so it knows what to do when I specify the font name, or something like that. Any help would be great. Many thanks Duncan -- Duncan Macleod duncan.macleod(a)ligo.org LIGO Data Grid systems development Louisiana State University

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Use of Pyplot in a GUI script
by Eric May 19, 2016

May 19, 2016

I've read that when writing a GUI application to avoid using pyplot. I experienced this when I wrote a python script that called the tkinter file dialog and then processed and plotted data. It would run when launched in Ipython but would crash when run in the terminal. It ran in terminal when I eliminated the file dialog and the file dialog code ran without the plotting. I rewrote the script using pyqt4, and avoided using pyplot using matplotlib figure instead. First question is is it true that I should avoid any use of pyplot in a gui app? Second is that I find it hard to do things in matplotlib that are easy in pyplot like drawing horizontal or vertical lines and such. Is there documentation and code examples using the matplotlib without pyplot? Thanks, Eric -- View this message in context: http://matplotlib.1069221.n5.nabble.com/Use-of-Pyplot-in-a-GUI-script-tp470… Sent from the matplotlib - users mailing list archive at Nabble.com.

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grouping in a legend
by Slavin, Jonathan May 17, 2016

May 17, 2016

Hi, I'm wondering if there's any way to group several items (i.e. handles) in a legend with a single label. Ideally I'd like to use something like a curly brace in the way one can in LaTeX using \right{. The use case is where you have several curves that share some characteristic and others that are different. This could be pushing legend beyond its limits. And of course I could just repeat the same label several times, but I thought I'd ask if anyone had come up with some clever way of doing this. 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 ________________________________________________________

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Matplotlib Tutorial - Dataquest
by jaypeedevlin May 17, 2016

May 17, 2016

Hi All, We've just released a matplotlib tutorial aimed at users with no experience with MPL. We would love your feedback on it: https://www.dataquest.io/blog/matplotlib-tutorial/ <https://www.dataquest.io/blog/matplotlib-tutorial/> Thanks in advance! -- View this message in context: http://matplotlib.1069221.n5.nabble.com/Matplotlib-Tutorial-Dataquest-tp470… Sent from the matplotlib - users mailing list archive at Nabble.com.

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Install/Import error rcParams
by yukicyk May 17, 2016

May 17, 2016

Hi all, I am trying to install matplotlib on my iMac OSX El Capitan Version 10.114 but failed. OS info: Darwin OBs-iMac.local 15.4.0 Darwin Kernel Version 15.4.0: Fri Feb 26 22:08:05 PST 2016; root:xnu-3248.40.184~3/RELEASE_X86_64 x86_64 gcc --version Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr --with-gxx-include-dir=/usr/include/c++/4.2.1 Apple LLVM version 7.3.0 (clang-703.0.29) Target: x86_64-apple-darwin15.4.0 Thread model: posix InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin I installed python using HomeBrew and pip install matplotlib. I got the following messages when i tried to import matplotlib: Python 2.7.11 (default, Jan 22 2016, 08:29:18) [GCC 4.2.1 Compatible Apple LLVM 7.0.2 (clang-700.1.81)] on darwin Type "help", "copyright", "credits" or "license" for more information. >>> import matplotlib Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/usr/local/lib/python2.7/site-packages/matplotlib/__init__.py", line 1131, in <module> rcParams = rc_params() File "/usr/local/lib/python2.7/site-packages/matplotlib/__init__.py", line 975, in rc_params return rc_params_from_file(fname, fail_on_error) File "/usr/local/lib/python2.7/site-packages/matplotlib/__init__.py", line 1100, in rc_params_from_file config_from_file = _rc_params_in_file(fname, fail_on_error) File "/usr/local/lib/python2.7/site-packages/matplotlib/__init__.py", line 1018, in _rc_params_in_file with _open_file_or_url(fname) as fd: File "/usr/local/Cellar/python/2.7.11/Frameworks/Python.framework/Versions/2.7/lib/python2.7/contextlib.py", line 17, in __enter__ return self.gen.next() File "/usr/local/lib/python2.7/site-packages/matplotlib/__init__.py", line 1000, in _open_file_or_url encoding = locale.getdefaultlocale()[1] File "/usr/local/Cellar/python/2.7.11/Frameworks/Python.framework/Versions/2.7/lib/python2.7/locale.py", line 543, in getdefaultlocale return _parse_localename(localename) File "/usr/local/Cellar/python/2.7.11/Frameworks/Python.framework/Versions/2.7/lib/python2.7/locale.py", line 475, in _parse_localename raise ValueError, 'unknown locale: %s' % localename ValueError: unknown locale: UTF-8 I later installed Anaconda hoping to resolve this problem, but still encounter the same error. Python 2.7.11 |Anaconda 4.0.0 (x86_64)| (default, Dec 6 2015, 18:57:58) [GCC 4.2.1 (Apple Inc. build 5577)] on darwin I would greatly appreciate for any help on this. cheers, yuki -- View this message in context: http://matplotlib.1069221.n5.nabble.com/Install-Import-error-rcParams-tp469… Sent from the matplotlib - users mailing list archive at Nabble.com.

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The dpi set is useless in my picture when using matplotlib
by tanweiwei＠pku.edu.cn May 16, 2016

May 16, 2016

I am learing to use matplotlib to produce high quality picture for my paper. The demand dpi of this magzine is 300. So, I wrote some example codes: import numpy as np import matplotlib.pyplot as plt a = np.linspace(0, 10, 100) b = np.linspace(0, 20, 100) plt.plot(a, b, 'o') plt.xlabel(r'$x$') plt.ylabel(r'$y$') plt.grid(True) plt.savefig('fig1.jpg', dpi=300, format='jpg') But I got a picure whose dpi is 72, and its size is 2400*1800. I'm confused about this outcome. I searched the Internet and some references about dpi setting, but I can't solve this problem anyway. Also I tried those: matplotlib.rcParams['savefig.dpi'] = 300 or plt.figure(dpi=300) or 'D:\Anaconda3\Lib\site-packages\matplotlib\mpl-data\matplotlibrc' in this file, make savefig.dpi=300. All of those is useless. I think the reason why the size of produced figure is 2400*1800. Because (300dpi*8 inches)*(300dpi*6 inches). The default size of figure in rc file is 8 inches and 6 inches. But why the dpi of this figure can't be changed! My operating system is windows 10. Anaconda 3 helped me to install matplotlib module. Thank for your help! Weiwei Tan Institute of Heavy Ion Physics School of Physics，Peking University

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Scipy John Hunter Plotting Contest: DEADLINE EXTENDED TO JUNE 3
by Michael Droettboom May 16, 2016

May 16, 2016

The Scipy John Hunter Excellence in Plotting Contest is a great opportunity to showcase advancement in the start of the art of visualization. Entries are still welcome, as the deadline has been extended to June 3, 2016. Entry Instructions - Participants are invited to submit scientific plots to be judged by a panel. - Entries must be submitted by June 3, 2016 via e-mail to plotting-contest(a)scipy.org - Plots may be produced with any combination of Python-based tools. (It is not required that they use matplotlib, for example.) - Source code for the plot must be provided, in the form of Python code and/or IPython notebook, along with a rendering of the plot in PDF format. If the original data can not be shared for reasons of size or licensing, “fake” data may be substituted, along with an image of the plot using real data. - Each entry must include a 300-500 word abstract describing the plot and its scientific importance for a general scientific audience. - Entries will be judged on their clarity, innovation and aesthetics, but most importantly for their effectiveness in illuminating real scientific work. Entrants are encouraged to submit plots that were used during the course of research, rather than merely being hypothetical. - SciPy reserves the right to display any and all entries, whether prize-winning or not, at the conference, use in any materials or on its website, with attribution to the original author(s). Michael Droettboom, chair Jacob Vanderplas Phil Elson

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