"Steve" == Steve Schmerler <elcorto@...361...> writes:
> Hi I recently posted something about segfaults I get when
> plotting. Now here is a little update and I really hope
> someone has an idea how I can solve this problem.
> I'm running IPython 0.6.13 on a Debian box, installed the
> recent mpl 0.83.2 from source, GTKAgg backend.
> 1)
> When I start ipython (as normal user) with the -pylab
> option and then say
> plot([1,2,3])
> I get
> In [1]: plot([1,2,3])
> ---------------------------------------------------------------------------
> exceptions.SystemError Traceback (most recent call last)
> SystemError: ../Objects/moduleobject.c:48: bad argument to
> internal function
You say this is a segfault, but it looks like an exception. Does this
actually kill the ipython shell? Is this a full posting of the
traceback?
I upgraded to IPython 0.6.15 (installed from source), the former 0.6.13 was apt-get installed on Debian (sarge, stable).
Actually, it is a segfault, and it kills the IPython shell.
···
###############################################################################
elcorto@...711...:~/Install/IPython$ ipython -pylab
/usr/lib/python2.3/site-packages/IPython/Shell.py:627: GtkDeprecationWarning: gtk.timeout_add is deprecated, use gobject.timeout_add instead
self.gtk.timeout_add(self.TIMEOUT, self.on_timer)
Python 2.3.5 (#2, May 4 2005, 08:51:39)
Type "copyright", "credits" or "license" for more information.
IPython 0.6.15 -- An enhanced Interactive Python.
? -> Introduction to IPython's features.
%magic -> Information about IPython's 'magic' % functions.
help -> Python's own help system.
object? -> Details about 'object'. ?object also works, ?? prints more.
Welcome to pylab, a matplotlib-based Python environment.
For more information, type 'help(pylab)'.
In [1]: plot([1,2,3])
---------------------------------------------------------------------------
exceptions.SystemError Traceback (most recent call last)
SystemError: ../Objects/moduleobject.c:48: bad argument to internal function
Speicherzugriffsfehler
elcorto@...711...:~/Install/IPython$
#################################################################################
At least "Speicherzugriffsfehler" is german for segfault 
I still can plot as root, but not as user!? If it's some kind of permission problem it would be good to know something about
"../Objects/moduleobject.c". I there a way to get IPython to print the full path?
BTW, Fernando mentioned earlier that this GtkDeprecationWarning would go away if I upgrade to IPython 0.6.15 but unfortunately it's still there.
What happens if you run the following script outside of ipython
from pylab import plot, show
plot([1,2,3])
show()
with
> python test.py --verbose-helpful
Does this create a proper figure window -- please post all output from
the script.
This works, a window shows up.
#################################################################################
elcorto@...711...:~/Install/IPython$ python test.py --verbose-helpful
matplotlib data path /usr/share/matplotlib
$HOME=/home/elcorto
CONFIGDIR=/home/elcorto/.matplotlib
loaded rc file /usr/share/matplotlib/matplotlibrc
matplotlib version 0.83.2
verbose.level helpful
interactive is False
platform is linux2
numerix Numeric 23.8
font search path ['/usr/share/matplotlib']
loaded ttfcache file /home/elcorto/.matplotlib/ttffont.cache
backend GTKAgg version 2.6.1
#################################################################################
> 2)
> However when I change to root
> su <pwd>
> ipython -pylab
> then plotting works fine!?
Perhaps this has something to do with having permission to connect to
the X11 server? As a normal user, can you launch graphical apps from
the shell, eg
> gedit&
I can do that.
Have you done anything unusual with your system, changed the default
permission bits, done a chroot, etc? What linux distro are you
running?
> I have no idea where this moduleobject.c lives or to which
> application it belongs.
> 2)
> If I try the same with the normal python interpreter
> python
> from pylab import *; ion() plot([1,2,3])
> a plot window pops up but shows no picture (no matter if
> I'm root or not).
Debian sarge, stable. I'm not a Linux expert but it's a pretty fresh installation (on my computer at work) and I can't see what I should have done wrong. In fact I installed mpl on my (the same) Debian at home and it works fine there (OK it's mpl 0.81 and IPython 0.6.13).
GTKAgg is not expected to work unless you are in a special threaded
environment like ipython with -gthread or -pylab. Try the same with
the TkAgg backend (edit your rc file) and let me know what happens.
Uh, I didn't build TkAgg, So I set BUILD_TKAGG = 'auto', but
python setup.py build
fails:
[...]
src/_tkagg.cpp:26:19: tk.h: Datei oder Verzeichnis nicht gefunden (file
not found)
[...]
error: command 'gcc' failed with exit status 1
Do I have to install something besides python-tk?
The last thing I'd advise is upgrading your ipython to the latest.
I've never seen this one before so I'm flying by the seat of my pants.
I hope we can sort this out.
cheers,
steve