Re: Connecting to gnuplot with Popen?

[John J. Lee]

Anton81 [EMAIL PROTECTED] writes:

  Hi Anton,
  
  here is a little snippet using os.popen:
 
 Unfortunately I'm having more problem getting the output from Gnuplot, which
 I'd like to examine for error messages and settings of options.

If you must roll your own, look at standard module subprocess.


John

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Re: Connecting to gnuplot with Popen?

[Anton81]

 Hi Anton,
 
 here is a little snippet using os.popen:

Unfortunately I'm having more problem getting the output from Gnuplot, which
I'd like to examine for error messages and settings of options.

Anton
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Re: Connecting to gnuplot with Popen?

[Laurent Pointal]

Anton81 a écrit :
 Hi,
 
 it seems to be a FAQ, but I still haven't found a solution. I want to
 control gnuplot with a python program. The following at least gives me the
 gnuplot output:

Unless you absolutely need to write your own code, you should try:
http://gnuplot-py.sourceforge.net/

A+

Laurent.
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Connecting to gnuplot with Popen?

[Anton81]

Hi,

it seems to be a FAQ, but I still haven't found a solution. I want to
control gnuplot with a python program. The following at least gives me the
gnuplot output:

subp=Popen(gnuplot,stdin=None,stderr=PIPE,stdout=PIPE)
...
subp.stderr.readline()

even though I'm not sure how to check if no more lines can be read with
readline() so that it doesn't block.
But after the script has finished, the console doesn't show me the
characters I type.

However, as soon as I try:

subp=Popen(gnuplot,stdin=PIPE,stderr=PIPE,stdout=PIPE)
...
subp.stderr.readline()

the program hangs.

What's wrong?

Anton
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Re: Connecting to gnuplot with Popen?

[Dan Sommers]

On Thu, 30 Mar 2006 12:59:01 +0200,
Anton81 [EMAIL PROTECTED] wrote:

 it seems to be a FAQ, but I still haven't found a solution. I want to
 control gnuplot with a python program ...

Unfortunately, I don't know how to solve your problem, but try this:

http://gnuplot-py.sourceforge.net/

Regards,
Dan

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Re: Connecting to gnuplot with Popen?

[Markus Weihs]

 I want to control gnuplot with a python program.

Hi Anton,

here is a little snippet using os.popen:


import os

gp = os.popen('gnuplot -persist', 'w')
print  gp, set yrange [-300:300]
for n in range(300):
print  gp, plot %i*cos(x)+%i*log(x+10) % (n,150-n)


Regards, mawe

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