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Re: error with Sum and Infinity

• To: mathgroup at smc.vnet.net
• Subject: [mg102437] Re: error with Sum and Infinity
• From: Richard Fateman <fateman at cs.berkeley.edu>
• Date: Sun, 9 Aug 2009 06:06:32 -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> <h5jdik$18j$1@smc.vnet.net>

Andrzej Kozlowski wrote:
> On 8 Aug 2009, at 02:16, Richard Fateman wrote:
> 
><attempt at humor snipped>
> 
>  he or she can  
> always evaluate
> 
> "SymbolicSumThreshold" /. SystemOptions[]
> 1000000
> 
> which, I think, deals with the rest of your post.
> 
> Andrzej

I assumed there was some name for that magic number, and now you tell me 
this is the name. Thanks.

1. In the Alphabetical List of functions and other objects in 
Mathematica, available as guide/AlphabeticalListing in the online manual 
for version 6.0,  there is no appearance of SymbolicSumThreshold.
Options[Sum] returns {}  On the plus side, searching  via  ? *Sum* 
reveals the presence of Global`SymbolicSumThreshold but with no 
information on it.

2. I assume you are implicitly agreeing with me that it is 
unsatisfactory to require any user to guess at the existence, name, and 
effect of an undocumented global flag. But you can't bring yourself to 
say so.


RJF

• References:
  • Re: error with Sum and Infinity
    • From: Richard Fateman <fateman@cs.berkeley.edu>