gnuplot-py-users

[Gnuplot-py-users] plotting

[Zoe C. <zoe...@iw...>]

Dear gnuplot-py users,

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


This doens't seem to work, what is my mistake?

Thank you very much for any help,
Zoe

-- 


      -----------------------------------------------------------------
      |   Zoe Cournia, Dipl.-Chem.          Phone:                    |
      |   University of Heidelberg          +49 6221 548808 (office)  |
      |   IWR - Computational Biophysics    +49 179 4840634 (mobile)  |
      |   Im Neuenheimer Feld 368           +49 6221 346050 (home)    |
      |   D-69120  Heidelberg               Fax: +49 6221 548868      |
      |                                                               |
      |           email: zoe...@iw...            |
      |         http://spider.iwr.uni-heidelberg.de/~cournia/         |
      -----------------------------------------------------------------

Re: [Gnuplot-py-users] plotting

[Michael H. <mh...@al...>]

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

Re: [Gnuplot-py-users] plotting

[Zoe C. <zoe...@iw...>]

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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>  
>

-- 
  

      -----------------------------------------------------------------
      |   Zoe Cournia, Dipl.-Chem.          Phone:                    |
      |   University of Heidelberg          +49 6221 548808 (office)  |
      |   IWR - Computational Biophysics    +49 179 4840634 (mobile)  |
      |   Im Neuenheimer Feld 368           +49 6221 346050 (home)    |
      |   D-69120  Heidelberg               Fax: +49 6221 548868      |
      |                                                               |
      |           email: zoe...@iw...            |
      |         http://spider.iwr.uni-heidelberg.de/~cournia/         |
      -----------------------------------------------------------------

Re: [Gnuplot-py-users] plotting

[Michael H. <mh...@al...>]

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