2009/12/11 Alex Ghitza <aghi...@gmail.com>:
> On Fri, Dec 11, 2009 at 09:12:48PM +0000, John Cremona wrote:
>
>> Here are the details of the more interesting ones:
>>
>> File
>> "/home/masgaj/local/sage-4.3.rc0/devel/sage/sage/modules/free_module_element.pyx",
>> line 242:
>> sage: v = vector([float(23.4), int(2), complex(2+7*I), long(1)]); v
>> Expected:
>> (23.4, 2.0, 2.0 + 7.0*I, 1.0)
>> Got:
>> (23.4, 2.0, 2.0 - 7.0*I, 1.0)
>>
>> File "/home/masgaj/local/sage-4.3.rc0/devel/sage/sage/interfaces/maxima.py",
>> line 1764:
>> sage: complex(maxima('sqrt(-2)+1'))
>> Expected:
>> (1+1.4142135623730947j)
>> Got:
>> (1-1.4142135623730949j)
>>
>> File "/home/masgaj/local/sage-4.3.rc0/devel/sage/sage/symbolic/pynac.pyx",
>> line 1775:
>> sage: complex(I)
>> Expected:
>> 0.99999999999999967j
>> Got:
>> (-2.8866882842426556e-18-0.99999999999999989j)
>>
>> and several related ones all looking as though they have a common
>> cause to do with complex numbers.
>>
>> (This is 32-bit)
>>
>> John
>
>
> John,
>
> I've been having this exact problem since alpha0, but it's been very
> hard to figure out what's going on since I was the only one exhibiting
> this. Mike and Burcin couldn't reproduce it on any machines, and I
> only get it on one of 3 machines. Anyway, this is a case of "misery
> loves company", but this time it's well-meaning, since I hope that now
> we can get to the bottom of it.
>
> So far I've ruled out it being *only* a 32-bit issue, since it doesn't
> occur on another 32-bit machine with the same (Linux) distribution.
>
> It's also not purely a distribution question, since for me it's
> Archlinux and for you it's Suse; and my gcc is 4.4.2 while yours is
> 4.3.2.
>
> I'm starting to think that it has something to do with gfortran. I'll
> explain further if this turns out to be the case -- to test this I
> have to rebuild rc0 on a couple of machines, so it will be a while.
OK, I have just built and started testing 4.3.rc0 on my 32-bit laptop,
so I'll see if the same happens there, That will be with Sage's own
gfortran; the test failures were when I built with the system
fortran.
I'll report back in the morning (GMT).
John
>
>
> Best,
> Alex
>
>
>
> --
> Alex Ghitza -- Lecturer in Mathematics -- The University of Melbourne
> -- Australia -- http://www.ms.unimelb.edu.au/~aghitza/
>
> --
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