[SciPy-Dev] lfilter segfault with initial condition on windows

Ariel Rokem arokem@berkeley....
Thu Mar 4 12:37:59 CST 2010


This is off-topic, but since the problem seems to have been solved, I'll go
ahead and ask: How do you get the revision number in your version number?

All I get is:

In [3]: scipy.version.version
Out[3]: '0.8.0.dev'

Thanks - Ariel

On Thu, Mar 4, 2010 at 6:39 AM, <josef.pktd@gmail.com> wrote:

> On Thu, Mar 4, 2010 at 9:29 AM, Oscar Benjamin
> <oscar.bristol@googlemail.com> wrote:
> > Hi,
> >
> > It seems this was just a problem with my installation somehow. Before
> > sending the previous email I had uninstalled and reinstalled both numpy
> > and scipy and the problem remained. I've just got back from lunch and
> > rebooted, uninstalled and reinstalled both again (using the same
> > installer files) and the problem seems now to be fixed. I'm not really
> > sure what happened there.
>
> good to hear,
> It is easy to get some left-over files from a previous install that
> create problems.
>
> Josef
>
> >
> > Thanks for your help,
> > Oscar.
> >
> > josef.pktd@gmail.com wrote:
> >> On Thu, Mar 4, 2010 at 8:06 AM, Oscar Benjamin
> >> <oscar.bristol@googlemail.com> wrote:
> >>
> >>> Hi,
> >>>
> >>> I've just discovered that a program of mine (which works on my ubuntu
> >>> karmic machine at home) segfaults on win32 at work.
> >>>
> >>> I've made a short test case:
> >>>
> >>>  > #!/usr/bin/env python
> >>>  >
> >>>  > from numpy import ones
> >>>  > from scipy.signal import lfilter
> >>>  >
> >>>  > x = ones(100)
> >>>  > a = ones(5)
> >>>  > b = ones(5)
> >>>  > zi = ones(4)
> >>>  > #xf = lfilter(b, a, x)
> >>>  > xf, zf = lfilter(b, a, x, zi=zi)
> >>>
> >>> Swap the comment on the last two lines to prevent segfault. On my
> >>> machine I get the "Unhandled Exception in python.exe" message box (I
> >>> assume this is a segfault).
> >>> versions:
> >>> python 2.6.4
> >>> numpy 1.3.0
> >>> scipy 0.7.1
> >>>
> >>> I can see a few tickets about problems with memory leaks and segfaults
> >>> with lfilter but they seem to be old and marked as closed. Should I
> >>> expect the above to work? Is this a known issue that's already fixed?
> >>>
> >>
> >> I don't have a segfault or any other problem with your script on
> >> WindowsXP with python 2.5.2. numpy 1.4.0 and a scipy from a while ago.
> >>
> >>>>> numpy.version.version
> >>>>>
> >> '1.4.0'
> >>
> >>>>> scipy.version.version
> >>>>>
> >> '0.8.0.dev6156'
> >>
> >> I also think I never had a segfault before with lfilter, and I have
> >> been using it for quite some time.
> >> (The only segfault I have seen is when scipy is not binary compatible
> >> with numpy 1.4.0)
> >>
> >> Are your numpy and scipy from the official installers?
> >>
> >> I don't know if there were any problems with python 2.6 before.
> >>
> >> Josef
> >>
> >>
> >>> Thanks,
> >>> Oscar.
> >>>
> >>> _______________________________________________
> >>> SciPy-Dev mailing list
> >>> SciPy-Dev@scipy.org
> >>> http://mail.scipy.org/mailman/listinfo/scipy-dev
> >>>
> >>>
> >> _______________________________________________
> >> SciPy-Dev mailing list
> >> SciPy-Dev@scipy.org
> >> http://mail.scipy.org/mailman/listinfo/scipy-dev
> >>
> >>
> >
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> >
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-- 
Ariel Rokem
Helen Wills Neuroscience Institute
University of California, Berkeley
http://argentum.ucbso.berkeley.edu/ariel
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