gnuplot-py-users Mailing List for Gnuplot.py

Problem solved! The "gnuplot.py" installation had failed because I 
wasn't in the root directory. Installing from the root directory solved 
this problem!!!

-------- Original Message --------
Subject: 	Import Error: No module named Gnuplot
Date: 	Mon, 19 Sep 2005 12:34:07 -0500
From: 	Tom Strickland <tl...@co...>
To: 	gnu...@li...



As a newbie I've just installed "gnuplot.py" after installing Numeric 
Python on my Mandrake Linux system. However, when I try to run "python 
demo.py", I get an Import Error message: "No module named Gnuplot"

The complete output is shown below.

I don't know what the problem is or how to fix it.

Thanks for your help!

*******************************************************************************************************************************


[tom@localhost ~]$ dir

Desktop LearnPython. rpmPkgs Welcome.desktop

firefox-installer numarray-1.3.3 
smoothwheel-0.44.7.20050605-fx+mz+ns+nv+tb.xpi XmaximaTut2004-1.tex

gnuplot-py-1.7 Numeric-24.0b2 thunderbird XmaximaWork2004.tex

install_flash_player_7_linux Python tmp

[tom@localhost ~]$ cd gnuplot-py-1.7

[tom@localhost gnuplot-py-1.7]$ python demo.py

Traceback (most recent call last):

File "demo.py", line 22, in ?

import Gnuplot, Gnuplot.funcutils

ImportError: No module named Gnuplot

[tom@localhost gnuplot-py-1.7]$

As a newbie I've just installed "gnuplot.py" after installing Numeric 
Python on my Mandrake Linux system. However, when I try to run "python 
demo.py", I get an Import Error message: "No module named Gnuplot"

The complete output is shown below.

I don't know what the problem is or how to fix it.

Thanks for your help!

*******************************************************************************************************************************


[tom@localhost ~]$ dir

Desktop LearnPython. rpmPkgs Welcome.desktop

firefox-installer numarray-1.3.3 
smoothwheel-0.44.7.20050605-fx+mz+ns+nv+tb.xpi XmaximaTut2004-1.tex

gnuplot-py-1.7 Numeric-24.0b2 thunderbird XmaximaWork2004.tex

install_flash_player_7_linux Python tmp

[tom@localhost ~]$ cd gnuplot-py-1.7

[tom@localhost gnuplot-py-1.7]$ python demo.py

Traceback (most recent call last):

File "demo.py", line 22, in ?

import Gnuplot, Gnuplot.funcutils

ImportError: No module named Gnuplot

[tom@localhost gnuplot-py-1.7]$

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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-- 
  

      -----------------------------------------------------------------
      |   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/         |
      -----------------------------------------------------------------

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

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/         |
      -----------------------------------------------------------------