From: Liang Wang [mailto:frank0...@gmail.com]
Sent: Thursday, August 16, 2012 6:50 PM
To: Benjamin Root
Cc: matplotlib-users@lists.sourceforge.net
Subject: Re: [Matplotlib-users] Any available backend for non-root users?
Thank you Ben,
I did use -X option upon ssh and I am running linux locally. The DISPLAY
variable is automatically "localhost:17.0", where the number 17 changes for
each login. But Tk would not work even after I export a new value to DISPLAY
like ":0.0". I even tried reinstalling matplotlib (from source or through
easy_install) with both values of DISPLAY but it always warns that Tk window
failed to open. When I try to use TkAgg, it says
...
import matplotlib.backends.tkagg as tkagg
File
"/ccs/home/lag69/.local/lib/python2.7/site-packages/matplotlib-1.1.0-py2.7-linux-x86_64.egg/matplotlib/backends/tkagg.py",
line 1, in <module>
import _tkagg
ImportError: No module named _tkagg
So far I haven't solved this problem and I have to generate png files to view
them (I can view them by xview or display of ImageMagick so the x11 forwarding
does work)
This is odd, and I almost lost my patient to try. But I still want to
appreciate your generous help, Ben.
regards,
Liang
On Thu, Aug 16, 2012 at 4:54 PM, Benjamin Root
<ben.r...@ou.edu<mailto:ben.r...@ou.edu>> wrote:
On Thu, Aug 16, 2012 at 4:26 PM, Liang Wang
<frank0...@gmail.com<mailto:frank0...@gmail.com>> wrote:
Hi everyone. I have trouble to find a usable background on a remote server
where I do not have root privilege. Unfortunately, there is no backend
available:
Tkinter: no
* Using default library and include directories for
* Tcl and Tk because a Tk window failed to open.
* You may need to define DISPLAY for Tk to work so
* that setup can determine where your libraries are
* located. Tkinter present, but header files are not
* found. You may need to install development
* packages.
Gtk+: no
* Building for Gtk+ requires pygtk; you must be able
* to "import gtk" in your build/install environment
Mac OS X native: no
Qt: no
Qt4: no
PySide: no
Cairo: no
The output of a simple script is
==================
simple_plot.py:
#
from pylab import *
plot([1,2,3])
show()
#
python simple_plot.py --verbose-helpful > output.txt
==================
$HOME=/ccs/home/user1
CONFIGDIR=/ccs/home/user1/.matplotlib
matplotlib data path
/ccs/home/user1/.local/lib/python2.7/site-packages/matplotlib-1.1.0-py2.7-linux-x86_64.egg/matplotlib/mpl-data
loaded rc file
/ccs/home/user1/.local/lib/python2.7/site-packages/matplotlib-1.1.0-py2.7-linux-x86_64.egg/matplotlib/mpl-data/matplotlibrc
matplotlib version 1.1.0
verbose.level helpful
interactive is False
platform is linux2
Using fontManager instance from /ccs/home/user1/.matplotlib/fontList.cache
backend agg version v2.2
When I tried to install pygtk, it requires glib, which is missing, and I just
did not digg further. So, is there any workaround that I can get ANY backend to
work (to show images on screen).
Any suggestions will be greatly appreciated (I really want to get things to
work).
Regards,
Liang
The Agg backend is always available for non-interactive plotting. In other
words, you won't be able to do a show() call, but you can save to any of the
image formats. The TkAgg backend should also be an option (unless that python
was built without Tk, which is rare). Often, if Tk isn't working, it is a
simple matter of setting your display environment correctly. Most of the time,
simply passing the "-X" option to ssh is sufficient (assuming you are sshing
from a linux box). Otherwise, I think you have to mess around with your
DISPLAY environment variable on the remote server (I think it is usually
":0.0", but I am no expert on this.
I hope that helps!
Ben Root
You need to install one of the optional backends. In your original email the
output you included is showing "no" for all of the interactive backends. So
somewhere when you're building mpl, either you don't have the right things
installed or the build is unable to locate them. Tk wasn't found during the
build, so no module called _tkagg was built, hence the import fails as you
report in your second email. Your current problem isn't with DISPLAY, but with
the build. Hopefully someone else can suggest some appropriate steps to take
to solve you build problems, but I'd first check if your python was built with
Tk.
Eric
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