Mailman 3 April 2016 - Matplotlib-users

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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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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How to integrated plt.fill with event handling
by Said Bashir April 29, 2016

April 29, 2016

Hi I am trying to integrate plt.fill() function of matplotlib in GUI by using event handling (http://matplotlib.org/users/event_handling.html). The aim is to connect the Matplotlib event to a callback function and then display plots. I would appreciate any ideas.

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(no subject)
by Said Bashir April 27, 2016

April 27, 2016

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errors when mp4 files played in browser
by gml＠garymlewis.com April 27, 2016

April 27, 2016

I've been using matplotlib's animation capability to produce mp4 files. No problems when the mp4 is viewed in a video player. But viewing the files in a browser is another story. With Ubuntu 15.10 and Firefox 45.0.2, for example, I get a message "Video can't be played because the file is corrupt." The problem is easily reproducible with several of the animation examples on matplotlib; eg, see: http://matplotlib.org/examples/animation/basic_example_writer.html. This produces two mp4 files: lines.mp4 (created with FuncAnimation) and im.mp4 (created with ArtistAnimation). Neither mp4 opens in Firefox for me. I also get the same result when using an animation saved with extra_args=['-vcodec', 'libx264'] that Jake Vanderplas recommends. My wife gets the same result on her Mac when using Firefox and Safari, but Chrome works fine. From a web search, I'd say the problem is browser related. For more details, see: https://bugzilla.mozilla.org/show_bug.cgi?id=987894 or https://support.mozilla.org/en-US/questions/1047078 So I'm not expecting the folks at matplotlib to have a solution for a browser issue. But I'd really like to make a few animations available on the web. That seems to imply the use of a web browser to view the files. Certainly that would be the most natural action; just click on the link to view the animation. My question then comes to this: does anyone on the matplotlib forum have experience with viewing mp4 files in a browser? If so, do you have any suggestions for a work-around? I've literally spent months getting a few matplotlib animations to the point where they may be useful to others. It never occurred to me that I'd have problems at the very last link in the chain. Thanks very much for your thoughts. Sorry this is so long. Gary

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Import error: Cannot import pylab modules
by blavergar April 26, 2016

April 26, 2016

Dear all, I want to use two programs (GroopM and QIIME) requiring matplotlib >=1.1.0 and python 2.7, which I have installed. My OS is Centos 6. They both give similar errors: 1. (...) *** ERROR RAISED DURING STEP: Plot Taxonomy Summary Command run was: plot_taxa_summary.py -i taxa_summary2/OTU_L2.txt,taxa_summary2/OTU_L3.txt,taxa_summary2/OTU_L4.txt,taxa_summary2/OTU_L5.txt,taxa_summary2/OTU_L6.txt -o taxa_summary2/taxa_summary_plots/ Command returned exit status: 1 Stdout: Stderr Traceback (most recent call last): File "/usr/local/bin/plot_taxa_summary.py", line 20, in <module> from qiime.plot_taxa_summary import make_all_charts File "/usr/local/lib/python2.7/site-packages/qiime/plot_taxa_summary.py", line 24, in <module> from pylab import rc, axis, title, axes, pie, figlegend, clf, savefig, figure\ *ImportError: cannot import name rc* Pylab is imported in plot_taxa_summary.py as follows: (...) import matplotlib import re matplotlib.use('Agg', warn=False) from matplotlib.font_manager import FontProperties from pylab import rc, axis, title, axes, pie, figlegend, clf, savefig, figure\ , close (...) 2. (...) File "/usr/local/lib/python2.7/site-packages/groopm/cluster.py", line 54, in <module> from pylab import show *ImportError: cannot import name show* And the content of cluster.py involving the importing of pylab is: (...) from sys import stdout, exit from colorsys import hsv_to_rgb as htr import matplotlib.pyplot as plt from pylab import show from numpy import (abs as np_abs, (...) As I read that pylab is installed directly with matplotlib I have already tried different versions and installations (conda, pip, yum...) but none of them got those programs working. Could someone help with this, please? Thank you! -- View this message in context: http://matplotlib.1069221.n5.nabble.com/Import-error-Cannot-import-pylab-mo… Sent from the matplotlib - users mailing list archive at Nabble.com.

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Re: [Matplotlib-users] Matplotlib-users Digest, Vol 9, Issue 24
by Ruth Sims April 25, 2016

April 25, 2016

Dear Eric, Many thanks for your help. The code runs fine from the command line and the graph is output as expected with the axis titles formatted correctly. Thanks Ruth On 24/04/2016 17:00, matplotlib-users-request(a)python.org wrote: > Send Matplotlib-users mailing list submissions to > matplotlib-users(a)python.org > > To subscribe or unsubscribe via the World Wide Web, visit > https://mail.python.org/mailman/listinfo/matplotlib-users > or, via email, send a message with subject or body 'help' to > matplotlib-users-request(a)python.org > > You can reach the person managing the list at > matplotlib-users-owner(a)python.org > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Matplotlib-users digest..." > > > Today's Topics: > > 1. Re: Render plot labels with LaTeX (Eric Firing) > 2. Re: errors when mp4 files played in browser (gml(a)garymlewis.com) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Sat, 23 Apr 2016 07:35:46 -1000 > From: Eric Firing <efiring(a)hawaii.edu> > To: matplotlib-users(a)python.org > Subject: Re: [Matplotlib-users] Render plot labels with LaTeX > Message-ID: <b917503c-252a-9ae0-91c4-d5e200f8e573(a)hawaii.edu> > Content-Type: text/plain; charset=windows-1252; format=flowed > > On 2016/04/23 3:09 AM, Ruth Sims wrote: >> Running Matplotlib v: 1.5.1 in Anaconda on OS X El Capitan, V 10.11.4 >> trying to render plot labels with LaTeX so I can use figures in my >> thesis. However, whenever I uncomment the command 'usetex = true', I >> receive an error similar to the below: >> >> RuntimeError: LaTeX was not able to process the following string: >> 'lp' >> Here is the full report generated by LaTeX: >> >> I have MacTeX-2015 and LaTeX, dvipng and ghostscript are each on my >> PATH. According to the instructions on >> <https://github.com/matplotlib/matplotlib/issues/5076>https://github.com/matplotlib/matplotlib/issues/5076 >> I was able to reproduce the code in a clean environment - so I assume >> there is nothing wrong with any of the installations. > Ruth, if you put the code from your first attachment in a file, and run > that file as a script from the command line instead of within ipython, > do you still get the error? It looks like even in your "clean > environment", some ipython startup code is being run (importing sympy, > etc.). There are also other places where pieces of old environment > might be getting pulled in, such as from a matplotlibrc file. > > Eric > >> I've tried most of the suggestions I found on various mailing lists but >> still received the same error. >> >> Thanks, >> Ruth Sims >> >> >> _______________________________________________ >> Matplotlib-users mailing list >> Matplotlib-users(a)python.org >> https://mail.python.org/mailman/listinfo/matplotlib-users >> > > > ------------------------------ > > Message: 2 > Date: Sat, 23 Apr 2016 14:44:07 -0400 > From: gml(a)garymlewis.com > To: Sebastian Berg <sebastian(a)sipsolutions.net> > Cc: matplotlib-users(a)python.org > Subject: Re: [Matplotlib-users] errors when mp4 files played in > browser > Message-ID: <99c9d63eff830aac346c5601d2609ea2(a)garymlewis.com> > Content-Type: text/plain; charset=US-ASCII; format=flowed > > Thanks, Sebastian. That sounds hopeful. What extra arguments did you > add? I'd like to give it a try to see if it fixes the problem I'm > having. ... Gary > > > On 2016-04-22 02:33, Sebastian Berg wrote: >> I had similar problems recently due to ffmpeg changing some defaults >> for the encoding. After realizing this was the problem, searching for >> it and adding the correct extra arguments for the movie creation to be >> passed to ffmpeg quickly solved the issue. >> >> - Sebastian >> >> >> On Do, 2016-04-21 at 22:45 -0600, Ryan May wrote: >>>> My question then comes to this: does anyone on the matplotlib forum >>>> have experience with viewing mp4 files in a browser? If so, do you >>>> have any suggestions for a work-around? I've literally spent months >>>> getting a few matplotlib animations to the point where they may be >>>> useful to others. It never occurred to me that I'd have problems at >>>> the very last link in the chain. >>>> >>>> Thanks very much for your thoughts. Sorry this is so long. >>> I've put some effort into making sure the animations will render in >>> the Jupyter Notebook, so I'm curious: on the platforms where you're >>> seeing problems, what do they do with the movie at the bottom of this >>> notebook >>> >>> http://nbviewer.jupyter.org/gist/dopplershift/356f2e14832e9b676207 >>> >>> ? >>> >>> Ryan >>> >>> -- >>> Ryan May >>> >>> _______________________________________________ >>> Matplotlib-users mailing list >>> Matplotlib-users(a)python.org >>> https://mail.python.org/mailman/listinfo/matplotlib-users >> _______________________________________________ >> Matplotlib-users mailing list >> Matplotlib-users(a)python.org >> https://mail.python.org/mailman/listinfo/matplotlib-users > > ------------------------------ > > Subject: Digest Footer > > _______________________________________________ > Matplotlib-users mailing list > Matplotlib-users(a)python.org > https://mail.python.org/mailman/listinfo/matplotlib-users > > > ------------------------------ > > End of Matplotlib-users Digest, Vol 9, Issue 24 > ***********************************************

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fille area under a step function
by amuls April 25, 2016

April 25, 2016

Hi All I make a plot of visible satellites at a ground station where calculations are performed every X minutes (eg 10 minutes). From these calculations I make a plot which,among other info, displays the number of visible satellites as a function of time using the drwa-style 'steps-post' (cfr line below) ax2.plot(predDates, nrVisSats, linewidth=3, color='black', drawstyle='steps-post', label='#Visible', alpha=.6) I would like to color the area between the time-axis and this line but I cannot find how to do that for a 'step' function. Tx for any help. Alain -- View this message in context: http://matplotlib.1069221.n5.nabble.com/fille-area-under-a-step-function-tp… Sent from the matplotlib - users mailing list archive at Nabble.com.

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Render plot labels with LaTeX
by Ruth Sims April 23, 2016

April 23, 2016

Running Matplotlib v: 1.5.1 in Anaconda on OS X El Capitan, V 10.11.4 trying to render plot labels with LaTeX so I can use figures in my thesis. However, whenever I uncomment the command 'usetex = true', I receive an error similar to the below: RuntimeError: LaTeX was not able to process the following string: 'lp' Here is the full report generated by LaTeX: I have MacTeX-2015 and LaTeX, dvipng and ghostscript are each on my PATH. According to the instructions on https://github.com/matplotlib/matplotlib/issues/5076 <https://github.com/matplotlib/matplotlib/issues/5076>I was able to reproduce the code in a clean environment - so I assume there is nothing wrong with any of the installations. I've tried most of the suggestions I found on various mailing lists but still received the same error. Thanks, Ruth Sims

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Attempting to get animated plot to work in this example
by Samuel Dupree April 22, 2016

April 22, 2016

I'm running matplotlib ver. 1.5.1 in an anaconda distribution on a MacBook Pro running Mac OS X ver. 10.11.4 (El Capitan). I'm attempting to get the animation portion of the example attached to this note running. I've looked through the on-line documentation on plot() and plot3d() but have turned up empty. Any thoughts. Sam Dupree.

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