Re: [Gnuplot-py-users] Gnuplot Problem

[Dee W. <DAW...@sa...>]

Thanks Leo,
=0D
That's what I think is happening as well, but as you know, with gnuplot no=
 way to prove it.  I guess it is time to experience the world of Python and=
 gnuplot-py.
=0D
Thanks again,
Dee

>>> lm...@ud... 09/30/04 10:00AM >>>
Hi Dee:

> I was thinking about using gnuplot-py to try to take of a problem I am=
 having with gnuplot itself.  I have a gnuplot script that runs  in a=
 endless 6 second loop (on purpose) that reads a data file that is updated=
 with new data every 4 seconds.  Eventually though, it will abort with the=
 following message:
>=0D
>=0D
> gnuplot> plot 'gnuplot.txt' index 0 using 1:2 with points 09,      =0D
>               'gnuplot.txt' index 1 using 1:2 with points 04,
>               'gnuplot.txt' index 2 using 1:2 with points 03,
>               'deviation_upper.txt' thru (( $1 * $2)/(-10.*55.1))**2     =
   with  lines 12,      =0D
>               'deviation_lower.txt' thru ((($1 * $2)/(-10. *55.1))**2)*=
 -1 with  lines 12 ,      =0D
>                U_CPS2 with lines 11 , L_CPS2 with lines 11
>                                                             ^
>          "/emsdat/santee/scripts/gplot/cps.pl", line 25395: no data point=
 found in specified file
>=0D
> Attached is the script and I would appreciate any suggestions on how to=
 make it work before I dive into Python.  If anyone thinks gnuplot-py can=
 fix the problem I would be most thankful for some help in getting started.

maybe gnuplot, everyonce in a while, trys to read  a data file while it
is being updated ? If the period of data update and data reading from
gnuplot are 6 and 4 seqs, chances are they'll meet at 12, 24, 36 sec.=
 (assuming
they start at the same time)

The advantage I would see on using gnuplot-py is that. within a python
script, you can check for existance/sanity of the data files before
feeding the gnuplot. So, you could, within the loop:

start endless loop:
  * import data files data into python arrays if files exist   =0D
  * check that the data is actually there, check types, value ranges, etc.
  * plot
  * wait some time
 =0D
Hope this helps,
Leo
   =0D


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