No plot window in matplotlib

Question

I just installed matplotlib in Ubuntu 9 10 using the synaptic package system   However  when I try the following simple example   gt  gt  gt  from pylab import plot   gt  gt  gt  plot  1 2 3   1 2 3     lt matplotlib lines Line2D object at 0x9aa78ec gt     I get no plot window  Any ideas on how to get the plot window to show

User · Answer

Try this   import matplotlib matplotlib use  TkAgg      BEFORE import pylab

User · Answer

pylab show   works but blocks  you need to close the window    A much more convenient solution is to do pylab ion    interactive mode on  when you start  all  the pylab equivalents of  pyplot   commands display their plot immediately  More information on the interactive mode can be found on the official web site   I also second using the even more convenient ipython -pylab  --pylab  in newer versions   which allows you to skip the from     import     part   pylab works  too  in newer IPython versions

User · Answer

If you encounter an issue in which pylab show   freezes the IPython window  this may be Mac nbsp OS nbsp X specific  not sure   you can cmd-c in the IPython window  switch to the plot window  and it will break out     Apparently  future calls to pylab show   will not freeze the IPython window  only the first call  Unfortunately  I ve found that the behavior of the plot window   interactions with show   changes every time I reinstall matplotlib  so this solution may not always hold

User · Answer

Another possibility when using easy install is that you need to require the most recent version of matplotlib  Try   import pkg resources pkg resources require  matplotlib     before you import matplotlib or any of its modules

User · Answer

Modern IPython uses the  --matplotlib  argument with an optional backend parameter  It defaults to  auto   which is usually good enough on Mac and Windows  I haven t tested it on Ubuntu or any other Linux distribution  but I would expect it to work   ipython --matplotlib

User · Answer

--pylab no longer works for Jupyter  but fortunately we can add a tweak in the ipython config py file to get both pylab as well as  autoreload functionalities   c InteractiveShellApp extensions     autoreload    pylab   c InteractiveShellApp exec lines      autoreload 2     pylab

User · Answer

Any errors show up  This might an issue of not having set the backend  You can set it from the Python interpreter or from a config file   matplotlib matplotlibrc  in you home directory   To set the backend in code you can do  import matplotlib matplotlib use  Agg     where  Agg  is the name of the backend  Which backends are present depend on your installation and OS   http   matplotlib sourceforge net faq installing faq html backends  http   matplotlib org users customizing html

User · Answer

The code snippet below works on both Eclipse and the Python shell   import numpy as np import matplotlib pyplot as plt    Come up with x and y x   np arange 0  5  0 1  y   np sin x     Just print x and y for fun print x print y    Plot the x and y and you are supposed to see a sine curve plt plot x  y     Without the line below  the figure won t show plt show

User · Answer

If you are starting IPython with the --pylab option  you shouldn t need to call show   or draw    Try this   ipython  --pylab inline

User · Answer

If you are user of Anaconda and Spyder then best solution for you is that    Tools --  Preferences --  Ipython console --  Graphic Section  Then in the Support for graphics  Matplotlib  section   select two avaliable options  and in the Graphics Backend   select Automatic

User · Answer

You can type  import pylab pylab show     or better  use ipython -pylab     Since the use of pylab is not recommended anymore  the solution would nowadays be   import matplotlib pyplot as plt  plt plot  1 2 3    plt show

[python] No plot window in matplotlib

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