[SciPy-User] Problem with scipy.special.chebyt

[Ivo Maljevic]

Sorry, you are right. Ubuntu does use 0.7.0, and it works for me as well:

>>> from scipy.special import chebyt
>>> chebyt(12)(-0.5)
0.99999999999992151

2009/8/29 Hugo Shi <humongo.shi at gmail.com>

> running ubuntu 9.04, ran this
>
> In [2]: import scipy.special
>
> In [3]: scipy.special.chebyt(12)(-0.5)
> Out[3]: 0.99999999999995792
>
> It works in ubuntu, and ubuntu 9.04 is using scipy 0.7.0
>
>
>
> On Sat, 2009-08-29 at 14:05 -0400, Ivo Maljevic wrote:
> > David, Pauli,
> > You guys are more versed with this. It should be fairly straighforward
> > to reproduce the problem. I just installed Mandriva 2009.1, 32 bit, as
> > a virtual machine, installed scimath package (which contains scipy),
> > and the problem show up right away. As Kristian said, when you run
> > python in gdb, the problem goes away on Mandriva. It doesn't go away
> > on openSUSE, though.
> >
> > So, the problem is not only on 64 bit distributions, and most likely
> > it is across  all the distributions, it is just that almost no one
> > uses chebyt, especially with these parameters. It doesn't fail with
> > chebyt(11)(-0.5). Also, it doesn't fail on Ubuntu, but I believe that
> > is because scipy used there is 0.6.
> >
> > Ivo
> >
> > 2009/8/29 David Cournapeau <cournape at gmail.com>
> >         On Fri, Aug 28, 2009 at 10:16 AM, Kristian Hans
> >         Sandberg<Kristian.Sandberg at colorado.edu> wrote:
> >         >
> >
> >         > Thank Neil! However, this is really funny: When I run it
> >         inside gdb, it works, but when I run it outside gdb, it
> >         crashes. See printout below:
> >
> >
> >         Build a debug scipy (python setup.py build_ext -g install) and
> >         run the
> >         test under valgrind, this should gives us useful information.
> >
> >         cheers,
> >
> >         David
> >
> >         _______________________________________________
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> >
> >
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