Databases
StackOverflow2013
Postsdbo
POPython Headless MatplotLib / Pyplot
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POPython Headless MatplotLib / Pyplot
    primarykey
    data
    text
    <p>I'm trying to make my data analysis and reports less <em>eye stabbing</em> and more graphical with automatically generated graph-files, and to do this I've been playing with matplotlib/pyplot/pylab. Works brilliantly, but when I try to run it on a headless server...</p> <pre><code>tkinter.TclError: no display name and no $DISPLAY environment variable </code></pre> <p>For this application I only use PyLab, but after a little google, I added the below to before the pylab import:</p> <pre><code>import matplotlib matplotlib.use("Agg") </code></pre> <p>Which should have changed the backend, but to no effect. </p> <p>Any ideas what I'm doing wrong? </p> <p>The remote machine does have X-forwarding capabilities, but since this application shouldn't NEED to display anything, I believe the usual ssh -X hack is overkill.</p> <p><strong>Examples:Fiendish Deception</strong></p> <p>Example <em>working</em> code on same machine</p> <pre><code>import matplotlib matplotlib.use("Agg") import numpy as np import pylab as pl xvals=np.arange(100) yvals=np.cumsum(np.random.random(100)) yvals[-10:]=0 yvals=np.log(yvals) pl.close() pl.plot(xvals,yvals) pl.xlabel("X") pl.ylabel("Y") pl.title("Title") pl.savefig("testgraph.png") </code></pre> <p><em>Non-working</em> real code</p> <pre><code>import matplotlib matplotlib.use("Agg") import numpy as np import pylab as pl import utility as util import os ... non graph stuff... def graph_p(self): pl.close() channels=range(self.p.shape[0]) for line in range(self.p.shape[1]): yvals=np.ma.masked_invalid(map(util.watts_to_dbmhz,self.p[:,line])) pl.plot(channels,yvals) #Error says it occurs here pl.xlabel("Subchannel Index") pl.ylabel("Power (dbmhz)") pl.title("Plot of per-tone power assignments for %d lines"%self.p.shape[1]) pl.savefig(self.dest+self.scenario+'-power.png') </code></pre> <p>Nothing else touches pyplot.</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USBolster
    1. USBolster
    plurals
    1. This table or related slice is empty.
    1. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    3. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POPython Headless MatplotLib / Pyplot
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. POPython Headless MatplotLib / Pyplot
      1. USunutbu
      1. VTFavorite
    3. VO
      singulars
      1. POPython Headless MatplotLib / Pyplot
      1. This table or related slice is empty.
      1. VTUpMod
    1. COIt is very strange, indeed. Can you post a minimum (non-)working example? The `Agg` backend should not need X.
      singulars
      1. POPython Headless MatplotLib / Pyplot
      1. USAndrea Spadaccini
    2. COUpdated with minimal example, but now I can't break it!
      singulars
      1. POPython Headless MatplotLib / Pyplot
      1. USBolster
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload