$ python loglogerr.py
[  1.   2.   3.   4.   5.   6.   7.   8.   9.  10.  11.] [ 359009.49171547  7852
58.99296454  784082.91801611  949337.16138993
  285725.17387374  330559.60896547  247160.91816842  325163.93556211
  834024.60221277  230214.02275976  631315.75184702] [ 21390.75304917  29465.675
37634  43158.03283922  83765.65105033
  60840.21478743   1443.23929621  27583.68539392  14671.03219401
  87128.47291984  80973.96112111  80604.68380336]
[ 337618.7386663   755793.3175882   740924.88517689  865571.5103396
  224884.95908631  329116.36966926  219577.2327745   310492.9033681
  746896.12929293  149240.06163865  550711.06804366]
Traceback (most recent call last):
  File "loglogerr.py", line 18, in ?
    show()
  File "/usr/lib/python2.3/site-packages/matplotlib/backends/backend_tkagg.py", 
line 68, in show
    manager.show()
  File "/usr/lib/python2.3/site-packages/matplotlib/backends/backend_tkagg.py", 
line 284, in show
    self.canvas.draw()
  File "/usr/lib/python2.3/site-packages/matplotlib/backends/backend_tkagg.py", 
line 135, in draw
    FigureCanvasAgg.draw(self)
  File "/usr/lib/python2.3/site-packages/matplotlib/backends/backend_agg.py", li
ne 310, in draw
    self.figure.draw(self.renderer)
  File "/usr/lib/python2.3/site-packages/matplotlib/figure.py", line 254, in dra
w
    for a in self.axes: a.draw(renderer)
  File "/usr/lib/python2.3/site-packages/matplotlib/axes.py", line 935, in draw
    self.transData.freeze()  # eval the lazy objects
ValueError: Cannot take log of nonpositive value