TclError Couldn't Connect to display ":0.0"

Community matplotlib-users
1

When I try to save a fig to a file I get the error

TclError Couldn't Connect to display ":0.0"

I looked in the Maplotlib users manual (latest version pg 144-146) and
tried the following with no luck. BTW why is the same module named
differently Linux/Win ?

import matplotlib
matplotlib.use('Agg')
import matplotlib.pylab as plt (linux ) or, import matplotlib.pyplot as
plt (Windows)
fig = plt.figure()
ax = fig.add_subplot(111)
ax.plot([1,2,3])
fig.savefig('test.png')

Is Matplotlib trying to display a plot to the monitor?

rlp

···

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2

rlp_GMC wrote:

When I try to save a fig to a file I get the error

TclError Couldn't Connect to display ":0.0"

I looked in the Maplotlib users manual (latest version pg 144-146) and
tried the following with no luck. BTW why is the same module named
differently Linux/Win ?
  

I presume you have different versions installed on each OS. pyplot was added only recently.

import matplotlib
matplotlib.use('Agg')
import matplotlib.pylab as plt (linux ) or, import matplotlib.pyplot as
plt (Windows)
fig = plt.figure()
ax = fig.add_subplot(111)
ax.plot([1,2,3])
fig.savefig('test.png')

Is Matplotlib trying to display a plot to the monitor?
  

If TkAgg is set as your backend, then, yes, it will try to open a window on the display. If you need to run on a remote headless server, for instance, you can use the Agg backend. I see that you are doing that (with the matplotlib.use('Agg')) line, so I'm surprised why any Tcl-related message would be displayed at all.

Can you provide the information described here:

http://matplotlib.sourceforge.net/faq/troubleshooting_faq.html#reporting-problems

Cheers,
Mike

···

--
Michael Droettboom
Science Software Branch
Operations and Engineering Division
Space Telescope Science Institute
Operated by AURA for NASA

3

Here is some additional information regarding this problem

OS -- Linux 2.6.22-16-generic #1 SMP Mon Jan 26 00:07:52 GMT 2009 i686
GNU/Linux

Moved matplotlibrc to "os.environ['HOME'] = '/tmp/matlibconfig'" because
of write permission problems with apache child processes.

No customizations to matplotlibrc

Ubuntu Gutsy

Python-matplotlib 0.90.1-2ubuntu1
Python-matplotlib-data 0.90.1-2ubuntu1
Python-matplotlib-doc 0.90.1-2ubuntu1

Code
# This code is called by another python script
# and I am not even using the parameters that
# are passed
# Code works from python idle

import sys, math
import matplotlib_config_path # this sets configpath as described above

import matplotlib
matplotlib.use('Agg') # use non gui backend

from matplotlib import pylab as plt
import numpy as np
import os,sys

def VT(batt_v, batt_temp0, batt_temp1, batt_ts, plotfile, dur):

    t =
    
    for x in batt_ts: # time axis to 0 based
        t.append((x - batt_ts[0])/divsor[dur])

    fig = plt.figure()
    ax1 = fig.add_subplot(111) # subplot 1 col x 1 row

    ax1.plot([1,2,3])
    fig.savefig('test.png')

Error returned is the same

rlp_GMC wrote:

···

When I try to save a fig to a file I get the error

TclError Couldn't Connect to display ":0.0"

I looked in the Maplotlib users manual (latest version pg 144-146) and
tried the following with no luck. BTW why is the same module named
differently Linux/Win ?

import matplotlib
matplotlib.use('Agg')
import matplotlib.pylab as plt (linux ) or, import matplotlib.pyplot as
plt (Windows)
fig = plt.figure()
ax = fig.add_subplot(111)
ax.plot([1,2,3])
fig.savefig('test.png')

Is Matplotlib trying to display a plot to the monitor?

rlp

--
View this message in context: http://www.nabble.com/TclError-Couldn't-Connect-to-display-"%3A0.0"-tp22176192p22207062.html
Sent from the matplotlib - users mailing list archive at Nabble.com.