gnuplot-py-users Mailing List for Gnuplot.py

Zoe Cournia wrote:
> Thank you for the answer. Indeed it works like this now.
> The structure of the files however, require that the command in gnuplot is:
> 
> plot 'temp/spectra9.dat' u 1:2
> 
> otherwise the file cannot be plotted (bad data in line 0)
> so is there a way to incorporate the 'u 1:2' command in the g.plot
> command that you siggest?
> 
> g.plot(Gnuplot.File('temp/spectra'+str(i)+'.dat'))

    g.plot(Gnuplot.File('temp/spectra'+str(i)+'.dat', using=1:2))

I recommend looking in demo.py for lots of examples like this.

Michael

Dear Michael,

Thank you for the answer. Indeed it works like this now.
The structure of the files however, require that the command in gnuplot is:

plot 'temp/spectra9.dat' u 1:2

otherwise the file cannot be plotted (bad data in line 0)
so is there a way to incorporate the 'u 1:2' command in the g.plot 
command that you siggest?

g.plot(Gnuplot.File('temp/spectra'+str(i)+'.dat'))

thank you
Zoe


Michael Haggerty wrote:

>Zoe Cournia wrote:
>  
>
>>I am trying to plot a series of files with python and gnuplot named
>>sequentially as:
>>
>>temp/spectra1.dat
>>temp/spectra2.dat
>>temp/spectra3.dat ..... and so on
>>
>>I am generating each of these files in a loop and try to open them and
>>store each file in a postscript file as:
>>
>>    
>>
>>>for i in range(1,detectors):
>>>    data = open('temp/spectra'+str(i)+'.dat','r')
>>>    g.plot(data)
>>>    g.hardcopy('gp_test'+str(i)+'.ps', enhanced=0, color=1)
>>>    g.q
>>>      
>>>
>
>To plot a file, you don't open the file using Python but rather pass the
>plot method a Gnuplot.File object, like
>
>    g.plot(Gnuplot.File('temp/spectra'+str(i)+'.dat'))
>
>With that change, I think it should work.
>
>(Of course, you could alternatively open the file using python, read the
>data into a python array, then plot the array, but that approach doesn't
>have any advantages unless you want to process the data before plotting it.)
>
>Michael
>
>
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