[Gnuplot-py-users] gnuplot.py plotting wrong numbers?

[Xaver W. <xav...@we...>]

Hi,
I'm a newbie to python programming, so I hope this is not a dumb mistake of 
mine ;-)

I am trying to plot large negative numbers, with 9 digits after the .,  via 
python (version 2.5.2-3) and python-gnuplot, version 1.8-1 (both Debian Sid 
packages), on terminal 'dumb', so ascii output.
But it occurs to me that whenever I plot them from a (float or string) python 
list (g.plot(Gnuplot.Data(list)), gnuplot is plotting a wrong number. 
Plotting a file (g.plot(Gnuplot.File('file.plt')) however works. Look at this 
example: I "zoomed in" to the first value here (the ascii formatting is lost 
due to the email, but I think you can see the problem; look at the asterisk 
psoition and y axis numbers!):

(12:55:03)xaver@siduxbox:~/Programme/python$./gw-minimal2.py test_real.log
39 cycles and -902.904164954  Hartree written to list of energies.
5 cycles and -902.912462667  Hartree written to list of energies.
6 cycles and -902.921650947  Hartree written to list of energies.
6 cycles and -902.927426487  Hartree written to list of energies.
6 cycles and -902.930537069  Hartree written to list of energies.
6 cycles and -902.933026922  Hartree written to list of energies.
21 cycles and -902.935555041  Hartree written to list of energies.
6 cycles and -902.937610935  Hartree written to list of energies.
6 cycles and -902.939101838  Hartree written to list of energies.
6 cycles and -902.94003734  Hartree written to list of energies.
6 cycles and -902.94119645  Hartree written to list of energies.
6 cycles and -902.942518852  Hartree written to list of energies.
15 cycles and -902.944932326  Hartree written to list of energies.
6 cycles and -902.947591728  Hartree written to list of energies.
6 cycles and -902.949241052  Hartree written to list of energies.
6 cycles and -902.950658896  Hartree written to list of energies.
6 cycles and -902.951400948  Hartree written to list of energies.
6 cycles and -902.952198923  Hartree written to list of energies.

list_scf is [[39, -902.90416495399995], [44, -902.912462667], 
[50, -902.92165094699999], [56, -902.92742648700005], 
[62, -902.93053706900002], [68, -902.93302692199995], 
[89, -902.93555504100004], [95, -902.93761093499995], 
[101, -902.93910183800006], [107, -902.94003734], [113, -902.94119645000001], 
[119, -902.94251885200003], [134, -902.94493232599996], 
[140, -902.94759172800002], [146, -902.94924105200005], 
[152, -902.95065889600005], [158, -902.95140094800001], 
[164, -902.95219892299997]]

list_scf[0][1] is -902.904164954

                                    Plotting float values:
  Energy/Hartree
   -902.904174810 ++-----+-------+------+-------+------+------+-------+-----++
                  +      +       +      +       +    SCF Optimization +.*..+ +
                  |      :                                                   |
                  |      :                                                   |
   -902.904174808 ++     :                                                  ++
                  |      :                                                   |
                  |      :                                                   |
   -902.904174806 ++     :                                                  ++
                  |      :                                                   |
                  |      *                                                   |
                  |                                                          |
   -902.904174804 ++                                                        ++
                  |                                                          |
                  |                                                          |
   -902.904174802 ++                                                        ++
                  |                                                          |
                  |                                                          |
                  +      +       +      +       +      +      +       +      +
   -902.904174800 ++-----+-------+------+-------+------+------+-------+-----++
                  20     40      60     80     100    120    140     160    
180
                                            Cycles


                                      Plotting plt file:
  Energy/Hartree
   -902.904164960 ++-----+-------+------+-------+------+------+-------+-----++
                  +      +       +      "test_real.log.plt" using 1:2 +.*..+ +
                  |      :                                                   |
                  |      :                                                   |
   -902.904164958 ++     :                                                  ++
                  |      :                                                   |
                  |      :                                                   |
   -902.904164956 ++     :                                                  ++
                  |      :                                                   |
                  |      :                                                   |
                  |      :                                                   |
   -902.904164954 ++     *                                                  ++
                  |                                                          |
                  |                                                          |
   -902.904164952 ++                                                        ++
                  |                                                          |
                  |                                                          |
                  +      +       +      +       +      +      +       +      +
   -902.904164950 ++-----+-------+------+-------+------+------+-------+-----++
                  20     40      60     80     100    120    140     160    
180

Does anyone know what's wrong here?
I can put all files on the net somewhere, if that helps.
Thanks in advance,
X. W.