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Re: Re: error with Sum and Infinity

  • To: mathgroup at smc.vnet.net
  • Subject: [mg102464] Re: [mg102437] Re: error with Sum and Infinity
  • From: DrMajorBob <btreat1 at austin.rr.com>
  • Date: Mon, 10 Aug 2009 04:15:06 -0400 (EDT)
  • References: <h5bk64$hlm$1@smc.vnet.net> <200908070932.FAA15211@smc.vnet.net>
  • Reply-to: drmajorbob at bigfoot.com

> Options[Sum] returns {}  On the plus side, searching  via  ? *Sum*
> reveals the presence of Global`SymbolicSumThreshold but with no
> information on it.

It's odd that ?*Sum* would reveal this thing, since

?SymbolicSumThreshold

and

?"SymbolicSumThreshold"

do not.

In fact, at my machine, ?*Sum* does NOT reveal it.

$Version

"7.0 for Mac OS X x86 (64-bit) (February 19, 2009)"

> 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.

Actually, I doubt he agrees at all.

Bobby

On Sun, 09 Aug 2009 05:06:32 -0500, Richard Fateman  
<fateman at cs.berkeley.edu> wrote:

> 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
>



-- 
DrMajorBob at bigfoot.com


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