John Hunter wrote:
> On Wed, Jul 16, 2008 at 6:12 AM, Angela Rivera Campos <[EMAIL PROTECTED]>
> wrote:
>> Hi, again
>>
>> I've trying to install everything, from the begining on another machine,
>> this one's running openSUSE 10.3. So I've installed the latest versions of
>> numpy, scipy and matplotlib and I've discovered something new which also
>> happens in the first machine, the one with openSUSE 10.2. The first time I
>> imported pylab this is what I got:
>>
>> ---------------------------------
>>>>> from pylab import *
>> /usr/lib/python2.5/site-packages/gtk-2.0/gtk/__init__.py:69: GtkWarning:
>> could not open display
>
> If you cannot open the display, most likely it is because either you
> are running as root (bad, bad) or you are running over a remot
> connection (ssh) and do not have X11 forwarding properly enabled or
> configures. If you want to use mpl with an interactive window, you
> will need to have access to the display. The fact that you see this
> error only on the first time you import pylab is typical of exceptions
> that are thrown at module import time -- python only tries to import
> once so you see the exception only once. To solve this, trying
> running as a normal user rather than root or sudo, and if you are on a
> remote machine, try using ssh -X to enable X11 forwarding. We will
> need to know more about exactly what you are doing to help.
For remote access you also need to allow the remote machine to access
the display via "xhost +name" on the local machine.
>> So googling a bit, I've found that to avoid this error an option would be to
>> add, before the pylab import, the following:
>>
>>>>> import matplotlib
>>>>> matplotlib.use('Agg')
>> This way the results floating problem disappears and I've got the correct
>> tuples, though now I can't make my script show the figure I'm trying to
>> plot. Is this related with matplotlibrc configuration? I haven't modified
>> this file and the only lines that are not commented are
>>
>> backend : GTKAgg
>> numerix : numpy # numpy, Numeric or numarray
>>
>> Running my script with and without these lines with --verbose-debug, I've
>> found that when they're written I get: backend agg version v2.2
>> and when they are not: backend GTKAgg version 2.10.6
>
> This isn't a problem with matplotlib, but with the connection to the
> display as I mentioned above.
> Hopefully once you get the display problem sorted out, all will be
> well. Let us know.
>
> JDH
>
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