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Windows; Invoking Octave

From: Reidar Strand Hagen
Subject: Windows; Invoking Octave
Date: Tue, 20 Jun 2006 18:17:27 +0200


I'm using Octave on windows, and am trying to communicate with it from
Python.. whether accomplished through pipes, or simply providing a
script for octave to run is of no importance, although I would like to
somehow catch stdout in case of error-messages.. and certainly don't
want to have the GUI flash up for simply running a script.

Previously, I did this with an older Octave version without support
for Nd-arrays etc without problems. I don't remember which version
(nor where I found it, but it had an installer and didn't need
seperate install of cygwin, and was installed to ~\GNU Octave without
versionnumbering),  However, after switching to octave-2.1.73-0 from
Octave-forge can't seem to communicate with Octave in any way except
manually through the GUI: The way Octave-forge is wrapped into cygwin
is confusing the **** out of me, so I was wondering if anybody had any

Reidar Strand Hagen


Attempting to run a script manually:

C:\Program Files\GNU Octave 2.1.73>type smallscript.txt
save abcdabcd

C:\Program Files\GNU Octave 2.1.73>"C:\Program Files\GNU Octave
2.1.73\bin\run.exe" rxvt.exe -e smallscript.txt

C:\Program Files\GNU Octave 2.1.73>dir abcdabcd
Volume in drive C has no label.
Volume Serial Number is 31FA-E7F7

Directory of C:\Program Files\GNU Octave 2.1.73

File Not Found


Attempting to run communicate through pipes:

Python 2.4.3 - Enthought Edition 1.0.0 (#69, Apr 18 2006, 15:43:47)
[MSC v.1310 32 bit (Intel)] on win32
IDLE 1.1.3

import subprocess
p = subprocess.Popen(r"c:\program files\GNU octave
2.1.73\bin\run.exe rxvt.exe -e /bin/sh",shell=False, stdin=
subprocess.PIPE, stdout= subprocess.PIPE, stderr= subprocess.STDOUT)
in_,out_ = p.communicate("a=5")

Traceback (most recent call last):
 File "<pyshell#2>", line 1, in -toplevel-
   in_,out_ = p.communicate("a=5")
 File "C:\Python24\lib\", line 783, in communicate
IOError: [Errno 22] Invalid argument

Running as a script instead of interactive will make communicate just
return ("",None).

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