[Numpy-discussion] OS X PPC problem with Numpy 1.3.0b1

Bruce Southey bsouthey@gmail....
Mon Mar 23 15:03:09 CDT 2009


Pauli Virtanen wrote:
> Mon, 23 Mar 2009 13:22:29 -0600, Charles R Harris wrote:
> [clip]
>   
>> PPC stores long doubles as two doubles. I don't recall exactly how the
>> two are used, but the result is that the numbers aren't in the form you
>> would expect. Long doubles on the PPC have always been iffy, so it is no
>> surprise that machar fails. The failure on SPARC quad precision bothers
>> me more.
>>     
>
> The test fails on SPARC, since we need one term more in the Horner series 
> to reach quad precision accuracy. I'll add that for long doubles.
>
>   
>> I think the easy thing to do for the 1.3 release is to fix the precision
>> test to use a hardwired range of values, I don't think testing the
>> extreme small values is necessary to check the power series expansion.
>> But I have been leaving that fixup to Pauli.
>>     
>
> I'll do just that. The test is overly strict.
>
>   
I do not know if this is related, but I got similar error with David's 
//windows 64 bits installer on my 64 bit Vista system. // 
http://mail.scipy.org/pipermail/numpy-discussion/2009-March/041282.html

In particular this code crashes:
>>>/ import numpy as np
/>>>/ info = np.finfo(np.longcomplex)
/
>/From the Windows Problem signature:
/  Fault Module Name:	umath.pyd


Bruce



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