[SciPy-dev] cgemv test failure

Nils Wagner nwagner at iam.uni-stuttgart.de
Wed Jun 28 03:41:25 CDT 2006


Travis Oliphant wrote:
> Nils Wagner wrote:
>   
>> Arnd Baecker wrote:
>>   
>>     
>>> just to report something positive with
>>> my (almost;-) daily build on 64Bit:
>>>
>>> With '0.5.0.2012' **all** tests pass on 64 Bit
>>> (apart from the well-known ndimage one).
>>>
>>> Best, Arnd
>>>
>>> _______________________________________________
>>> Scipy-dev mailing list
>>> Scipy-dev at scipy.net
>>> http://www.scipy.net/mailman/listinfo/scipy-dev
>>>   
>>>     
>>>       
>> On 32 bit there is still one failure but I cannot reproduce it on a 64
>> bit system. Why ?
>>   
>>     
>
> I don't know.  I looked at it a bit, but couldn't see anything obvious.
>
> But, since you have access to both systems you are in a great position 
> to figure out why it is failing on 32-bit systems.   Insert some 
> print-statements in the fmin_cobyla code (the calcfc function might be a 
> good place) and compare the outputs on the two systems when you run just 
> that test. 
>
> It would be great if you could help track it down.
>
> -Travis
>
>
>
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>   

Travis,

Here is the output of mycobyla.py

32bit:
Linux amanda 2.6.11.4-21.12-default #1 Wed May 10 09:38:20 UTC 2006 i686
athlon i386 GNU/Linux

Result by cobyla with one constraint [ 4.95535574  0.66667043]

Result by cobyla with two constraints [ 4.957975    0.64690335]

Exact results [ 4.95535625  0.66666667]


64bit:
Linux lisa 2.6.13-15.10-default #1 Fri May 12 16:13:03 UTC 2006 x86_64
x86_64 x86_64 GNU/Linux

Result by cobyla with one constraint [ 4.95535574  0.66667043]

Result by cobyla with two constraints [ 4.95535778  0.6666553 ]

Exact results [ 4.95535625  0.66666667]

So, the difference in the results is associated with the constraints. Do
you agree ?

Nils

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