Re: Why Mathematica does not issue a warning when the calculations
- To: mathgroup at smc.vnet.net
- Subject: [mg117822] Re: Why Mathematica does not issue a warning when the calculations
- From: Andrzej Kozlowski <akoz at mimuw.edu.pl>
- Date: Fri, 1 Apr 2011 02:31:34 -0500 (EST)
- References: <in1n51$6sj$1@smc.vnet.net> <4D94A19A.8090001@cs.berkeley.edu>
On 31 Mar 2011, at 17:45, Richard Fateman wrote:
> On 3/31/2011 4:05 AM, Andrzej Kozlowski wrote:
>> On 31 Mar 2011, at 11:03, Richard Fateman wrote:
>>
>>> Here's a way around this issue, I think. For every function of
>>> interest, do something like this:
>>> prec;
>>> f[x_]:=Block[ {$MaxPrecision=prec,$MinPrecision=prec}, Whatever...]
>>>
>>> This is even less intuitive than your suggestion.
>>>
>>>
>>> RJF
>>
>>
>> An original and surprising suggestion, particularly in view of the following:
>>
>>
>> On 29 Mar 2011, at 13:53, Andrzej Kozlowski wrote:
>>
>>> In addition (for some curious reason) Richard never bothers to point out that
>>>
>>> z = 1.0000000000000000000;
>>> Block[{$MaxPrecision = 20, $MinPrecision = 20},
>>> Table[(z = 2*z - z), {42}]]
>>
>> Andrzej Kozlowski
>>
>
> Certainly Andrzej was not the first to post this on mathgroup, nor was I.
> My point, which Andrzej may have lost sight of, is that to make this setting effective, one must rephrase each and every function this way.
And what on earth made you think I "lost sight" of this obvious point?
Andrzej