On Mon, Dec 28, 2009 at 11:16 AM, Gökhan Sever <gokhansever@gmail.com> wrote:


On Mon, Dec 28, 2009 at 11:07 AM, Robert Kern <robert.kern@gmail.com> wrote:
On Mon, Dec 28, 2009 at 11:00, Gökhan Sever <gokhansever@gmail.com> wrote:

> One interesting thing I have noticed while installing the numpy from the
> source is that numpy dependent libraries must be re-installed and this must
> be a clean re-install. For instance I can't import some matplotlib and scipy
> modules without making a fresh installation for these packages. My attempts
> result with a runtime error.

Please, please, always copy-and-paste the traceback when reporting an
error. I know you aren't formally reporting a bug here, but it always
helps.

> Could someone clarify this point? Is this due
> to API change in the numpy core?

Cython/Pyrex code does a runtime check on the struct sizes of types.
We have carefully added a member to the PyArrayDescr struct; i.e. it
shouldn't cause any actual problems, but Cython does the check
anyways. This affects a few modules in scipy, but shouldn't have
affected anything in matplotlib. The traceback may help us identify
the issue you are seeing.


It is too late for the tracebacks. I have already removed the problematic packages and did clean installs. However, next time I will be more careful while reporting such issues. If it helps, in both matplotlib (via ipython -pylab) and scipy.stats import cases the runtime errors was raised due to numpy.core.multiarray module import.

 
--

Robert Kern

"I have come to believe that the whole world is an enigma, a harmless
enigma that is made terrible by our own mad attempt to interpret it as
though it had an underlying truth."
 -- Umberto Eco
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--
Gökhan

Here is another interesting point to consider. To reproduce the runtime error I mentioned previously I downgraded numpy (from the latest check-out installation) following these steps:

svn co http://svn.scipy.org/svn/numpy/branches/1.3.x/ numpy
cd numpy
python setup.py install
Writing /usr/lib/python2.6/site-packages/numpy-1.3.1.dev8031-py2.6.egg-info

I[2]: import matplotlib.pyplot as plt
Segmentation fault

I[3]: from scipy import stats
Segmentation fault

I have installed matplotlib and scipy using the latest numpy dev version. A little later I will downgrade matplotlib and scipy to their previous stable versions, and compile them using numpy 1.3.x. Afterwards I will update numpy and test to see if I can re-produce the runtime error to provide the tracebacks. First let me know if any tracebacks needed for these segfaults or are these known failures?

================================================================================
Platform     : Linux-2.6.29.6-217.2.3.fc11.i686.PAE-i686-with-fedora-11-Leonidas
Python       : ('CPython', 'tags/r26', '66714')
================================================================================


--
Gökhan