Re: [Gnuplot-py-users] Gnuplot Problem

[Leonardo M. <lm...@ud...>]

On Thursday 30 September 2004 10:39, Dee Wortman wrote:
> 
> Thanks Leo,
> 
> 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.
> 
> Thanks again,
> Dee

My pleasure :-)

IMHO if you need a jump start, you may wanna:

1) Install Python + Numeric extension
2) Install gnuplot-py
3) Run and play with the test/sample code in Gnuplot-py.
4) quick read to the python tutorial 
5) http://docs.python.org/tut/tut.html
6) get familiar with the docs, http://www.python.org/doc/
   I always end up browsing the modules index: 
   http://docs.python.org/modindex.html
   You'll need at least
   http://docs.python.org/lib/module-os.html
   http://docs.python.org/lib/module-os.path.html

One afternoon and plenty of coffee/green tea should do, really!

Gotta go, best!
-- leo


> 
> > 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:
> >
> >
> > gnuplot> plot 'gnuplot.txt' index 0 using 1:2 with points 09,      
> >               '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,      
> >               'deviation_lower.txt' thru ((($1 * $2)/(-10. *55.1))**2)* -1 with  lines 12 ,      
> >                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
> >
> > 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   
>   * check that the data is actually there, check types, value ranges, etc.
>   * plot
>   * wait some time
>  
> Hope this helps,
> Leo
>    
> 
> 
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