Re: [boost] [rfc] Inexact quantities arithmetics

From: Marat Khalili (0x8.0p15_at_[hidden])
Date: 2007-07-10 00:42:57

Hello,

Thank you for response.

Lewis Hyatt wrote:
>> 6. Correlations are not considered; instead, worst case is always assumed.
>> For example:
>>      (mx +- dx) + (my +- dy) gives ((mx + my) +- (dx + dy), not ((mx +
>> my) +- sqrt(dx*dx + dy*dy);
> 
> It is hard for me to imagine a case when
> simply adding the errors like this is in any way meaningful.

Isn't it the case when numbers are fully correlated? This gives largest 
error, this is the way I go. Well, _actual_ correlations are not 
considered, user has to do it manually when needed.

With Best Regards,
Marat