[SciPy-user] amd64 specific error in fitpack spline interpolation

[Stefan van der Walt]

On Wed, Aug 30, 2006 at 10:00:26PM +1200, Angus McMorland wrote:
> Hi all, 
> 
> I posted about this problem a few months ago, but we didn't get very
> far, but the annoyance level of the problem is enough now for me to have
> another go.
> 
> I'm trying to run the spline example from the cookbook (my exact code,
> called spl.py, is inlined below). On an ix86 computer this works fine,
> and returns the expected graphs, but on an amd64 machine I get the error
> below. Both computers are running debian etch, with recent svn numpy and
> scipy.
> 
> TypeError: array cannot be safely cast to required type
> > /usr/lib/python2.4/site-packages/scipy/interpolate/fitpack.py(217)splprep()
>     216
> t,c,o=_fitpack._parcur(ravel(transpose(x)),w,u,ub,ue,k,task,ipar,s,t,
> --> 217                              nest,wrk,iwrk,per)
>     218     _parcur_cache['u']=o['u']

Hi Angus,

This is fixed in SVN (it works on the AMD Athlon 64 that I have access
to).  The C-wrappers expect 32-bit integers, instead of the 64-bit
integers associated with 'int' on your platform.

Can any of the developers tell me what the correct way is of handling
64-bit integers in C, using the numpy API?  Or more specifically, of
handling the default system type integer.

Regards
Stéfan