[SciPy-dev] erf, erfc and ndtr on OS X

Charles R Harris charlesr.harris@gmail....
Fri May 1 18:27:33 CDT 2009

2009/5/1 Stéfan van der Walt <stefan@sun.ac.za>

> Hi Tobias
> 2009/5/1 Tobias Wood <twood@doc.ic.ac.uk>:
> > I'm not sure whether this should go to the dev or users list, so sorry if
> > it is in the wrong place. I'm using the lastest SVN Numpy/Scipy checkouts
> > with Python 2.6 on Mac OS 10.5. I was trying to use the ndtr function in
> > scipy.special and discovered that it returned 0.5 for all input values
> > except +/-Inf. A little bit of searching pulled up the following bug
> > ticket:
> > http://projects.scipy.org/scipy/ticket/899
> > What is the likelihood of this being fixed in the SVN repository?
> Very good :)
> Pauli and I had a look, and it seems that for some reason the
> Endianess of your system was detected incorrectly.  This could be
> because of a Python header built on a different system, I'm not sure.
> Either way, we removed the Endianess detection, so you should no
> longer experience problems.

There was a problem with the endianess in the python header for some
versions of python2.6 on Apple. I believe David got it the python folks to
fix it in the most recent versions. Numpy now detects incompatible endianess

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