I believe you intended to post this message to the Maven user's
mailing list. The phenomemon you are observing is consistent with MUP
(the maven uncertainty principle) which states that two executions in
different locations or at different times will produce different
results almost surely. There is a conjecture that states that this
principle applies to anything built with maven and anything that
references or is referenced by anything built with maven (directly
/or/ through transitive dependencies) . While the conjecture is
generally believed to be true no proof is known at this time.
-mbs
On 1/4/07, chris <[EMAIL PROTECTED]> wrote:
Hi,
For my Thesis, I had reason to perform a number of identical
experiments with simple variations: displacements in space or time.
One set of experiments was using ODE:
I did a simple rigid body physics experiment using pyode: dropped a
box near a stationary box onto a plane. I saved an image of the rest
position of the box. The experiment is repeatable: the box lands in
same place each time relative to the stationary one.
Then I moved the whole experiment by (10,10,10) and repeated it. The
box rest position was different.
I also repeated the first experiment with the only difference being
that I programmed it to wait 8000 seconds before dropping the box.
Again the rest position was difference.
What do the developers of ODE have to say as to the cause of the
sensitivity of ODE to changes in position or time?
Attached are images of the rest position in the first and second
experiments and the code used to produce each. Also image of the time
displaced version and its code.
The hardware I was using was a VAIO notebook: intel 770 CPU with
radeon x600 GPU. For python install I followed the steps from Miriam
English:
1. installed python 2.4
python-2.4.3.msi
http://www.python.org/ftp/python/2.4.3/
2. edited autoexec.bat to add:
SET PATH=%PATH%;C:\python
SET PYTHON=C:\PYTHON\
3. installed pyOpenGL
PyOpenGL-2.0.2.01.py2.4-numpy23.exe
http://pyopengl.sourceforge.net
4. Copied glut32.dll to the C:\python\Lib\site-packages\OpenGL
directory. (This is a *crucial* step.)
glut32.dll
http://www.xmission.com/%7Enate/glut.html
5. installed OpenGLContext
OpenGLContext-2.0.0c1.win32-py2.4.exe
http://pyopengl.sourceforge.net/context/
(downloaded from http://pyopengl.sourceforge.net/ )
6. installed PIL (python Image Library)
PIL-1.1.5.win32-py2.4.exe
http://www.pythonware.com/products/pil/
7. installed pyODE
PyODE-1.1.0.win32-py2.4.exe
http://pyode.sourceforge.net/
Now I can double-click on the tutorial3.py from
http://pyode.sourceforge.net/ and it simply runs!
thanks,
chris
