[SciPy-user] Bugs in special

Nils Wagner nwagner@iam.uni-stuttgart...
Tue Apr 10 07:01:33 CDT 2007


Eli Brosh wrote:
> Thank you Nils
> I looked at the tickets 
> http://projects.scipy.org/scipy/scipy/ticket/301 <http://projects.scipy.org/scipy/scipy/ticket/301> 
>
> http://projects.scipy.org/scipy/scipy/ticket/387 <http://projects.scipy.org/scipy/scipy/ticket/387> 
>
> It seems that inded, there are some serious bugs in  Bessel and Kelvin functions in 'special' package.
> However, the bugs reported in these "tickets" are not the bug I encountered. 
> Perhaps they are related.
>  
> Eli
>  
>  
>  
>
> ________________________________
>
> From: scipy-user-bounces@scipy.org on behalf of Nils Wagner
> Sent: Mon 02/04/2007 13:59
> To: SciPy Users List
> Subject: Re: [SciPy-user] Bugs in special
>
>
>
> On Mon, 2 Apr 2007 13:03:03 +0300
>   "Eli Brosh" <ebrosh@nana.co.il> wrote:
>   
>> Hello
>> I am trying to convert from MATLAB to Python with SciPy.
>> I am using Python 2.4.3 for Windows (Enthought Edition)
>> As a start, I tried to use the special functions from
>> the SciPy  "special" module.
>> There, I encountered some problems that may be a result
>> of bugs in SciPy.
>>
>>
>> The session (in IDLE) goes like:
>>
>>     
>>>> >from scipy import *
>>>>         
>>>>> x=.5
>>>>> special.jv(0,x)
>>>>>           
>> 0.938469807241
>>     
>>>>> y=.5+1.j
>>>>> y
>>>>>           
>> (0.5+1j)
>>     
>>>>> special.jv(0,y)
>>>>> ================================ RESTART
>>>>> ================================
>>>>>           
>> When I try to put a complex argument in special.jv, I
>> get an error message from the operating system (windows
>> XP):
>> It says "pythonw.exe has encountered a problem and needs
>> to close. We are sorry for the inconvenience."
>>
>> The IDLE does not close but it is restarted:
>> There appears a line:
>>     
>>>>> ================================ RESTART
>>>>> ================================
>>>>>           
>> This does not occur when the argument of special.jv is
>> real.
>>
>> However, even real arguments in special.ber and
>> special.ker provoked the same crash and the same error
>> message.
>>
>>
>>
>> Is this a bug in SciPy or am I doing something wrong ?
>>
>>
>> Thanks
>> Eli
>>
>>     
> See the tickets
>
> http://projects.scipy.org/scipy/scipy/ticket/301
>
> http://projects.scipy.org/scipy/scipy/ticket/387
>
> Nils
>  
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>
>
>   
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>   
I cannot reproduce your bug here. (SuSE Linux 64-bit)

>>> y=.5+1.j
>>> y
(0.5+1j)
>>> special.jv(0,y)
(1.179856630403078-0.27372678559101116j)
>>> import scipy
>>> scipy.__version__
'0.5.3.dev2901'
 
Nils



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