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MathGroup Archive 2006

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Re: Problem with derivate of product

  • To: mathgroup at smc.vnet.net
  • Subject: [mg67342] Re: [mg67309] Problem with derivate of product
  • From: Andrzej Kozlowski <akoz at mimuw.edu.pl>
  • Date: Sun, 18 Jun 2006 05:14:01 -0400 (EDT)
  • References: <200606170836.EAA28052@smc.vnet.net> <83AE65A6-9C96-4721-90EA-F5D1FE82ADAA@mimuw.edu.pl> <Pine.OSF.4.58.0606180338590.137680@sirppi.helsinki.fi>
  • Sender: owner-wri-mathgroup at wolfram.com

On 18 Jun 2006, at 09:49, Esa A E Peuha wrote:

> On Sat, 17 Jun 2006, Andrzej Kozlowski wrote:
>
>> On 17 Jun 2006, at 17:36, Esa A E Peuha wrote:
>>
>>> Mathematica 5.0 seems to have trouble with parsing this input:
>>>
>>> In[1]:= D[Product[f[k,z],{k,0,m}],{z,n}]
>>>
>>> Out[1]= D[Product[f[k, z], {k, 0, m}], z]
>>>
>>> Has this been fixed in newer versions?
>>>
>>> --
>>> Esa Peuha
>>> student of mathematics at the University of Helsinki
>>> http://www.helsinki.fi/~peuha/
>>>
>>
>> No. Also, I do not think there is any plan to "fix it" because it is
>> not considered to be "broken".
>
> Do you mean that the change from "{z,n}" to "z" is what should happen
> in this case?  (No, n has not been set equal to 1.)
>

No, I misunderstood you (sorry) by not looking carefully at the  
output. Nothing should happen but something does, which indeed looks  
like a very weird bug.

Andrzej Kozlowski 


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