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Re: Re: error with Sum and Infinity

  • To: mathgroup at smc.vnet.net
  • Subject: [mg102409] Re: [mg102387] Re: error with Sum and Infinity
  • From: Andrzej Kozlowski <akoz at mimuw.edu.pl>
  • Date: Sat, 8 Aug 2009 04:38:55 -0400 (EDT)
  • References: <h5bk64$hlm$1@smc.vnet.net> <200908070932.FAA15211@smc.vnet.net> <29EAD82D-4D06-4036-923E-97DD7B2EDC46@mimuw.edu.pl> <4A7C6176.9060002@cs.berkeley.edu>

On 8 Aug 2009, at 02:16, Richard Fateman wrote:

> Andrzej Kozlowski wrote:
>>
>> On 7 Aug 2009, at 18:32, Richard Fateman wrote:
>>
>>> Well, see Elton TeKolste's remarkable post.
>>> I doubt that the "feature" he illustrates would be known even by  
>>> most
>>> experienced users.
>>
>>
>> Well, you are wrong. For example, check this post (about the  
>> fastest way of adding up a billion numbers)
>>
>> http://forums.wolfram.com/mathgroup/archive/2007/Mar/msg00565.html
>>
>> and the rest of the discussion.
>
> I think you flatter yourself and mathgroup to think that "most  
> experienced users" will have read your post from March, 2007.

Are you saying that there are "experienced users" who have not read  
all my posts? Impossible!

However, should such a strange phenomenon really exist, he or she can  
always evaluate

"SymbolicSumThreshold" /. SystemOptions[]
1000000

which, I think, deals with the rest of your post.

Andrzej



> I just checked the documentation and I see no notice of that magic  
> number  (though maybe it is there somewhere and I missed it??).
>
>
> Is there a way of finding that magic number without experimentation  
> or "insider" knowledge?  Would "most experienced users" know that?
>
> If it is not in the documentation, the rules of the game mean that  
> WRI is free to change that magic number, or eliminate it, without  
> notice, so any experienced user would be loathe to take advantage of  
> it for fear that any program utilizing it would cease to work in a  
> new version.
>
> RJF




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