Re: [boost] [Review][PQS] Review deadline

From: John Phillips (phillips_at_[hidden])
Date: 2006-06-14 10:49:39

   Many nuclear reaction rates are modeled in series expansions based on 
the 1/3 power of the temperature.
   In general, fitting formulas to measured phenomena will happily use 
any power you can imagine, if it gets the behavior right.

                        John Phillips

Janek Kozicki wrote:
> Andy Little said:     (by the date of Tue, 13 Jun 2006 00:59:11 +0100)
> 
> 
> 
>>t1_quantity type in PQS is overcomplicated. Two decisions complicated the design
>>of t1_quantity. The first was the requirement to distinguish dimensionally
>>equivalent quantities (torque and energy say).
> 
> 
> IMHO this distinguish is not that important. We only need units so that
> compiler will check if there is any mistake in the formulas...
> 
> Difference between torque and energy happens only during serialization
> (print N*m, or print J ?), so maybe instead of complicated
> abstract_quantity_id, there should be just some extra argument/setting
> that will talk with serialization functions?
> 
> Maybe this will make the design a bit leaner.
> 
> 
>>The second was the use of
>>rational rather than integer powers of dimension. 
> 
> 
> someone suggested using integer powers with twice the value of the
> represented power. That will allow to have one fractional power: an sqrt
> of dimension. Maybe that will solve this?
> 
> Anyone has seen in work a fractional power of unit, different than square root?
> 
>