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From: Paul A. Bristow (boost_at_[hidden])
Date: 2003-04-16 16:20:10

Some measurements have this property (some balance weights for example).

But I think an 'uncertain library' might be derived from the interval library
(and from the SI quantity library too).

(From what I have done on an 'uncertain library' following from the work

// Based on code by Evan Manning (manning_at_[hidden])
// Evan Marshal Manning C/C++ Users Journal, March 1996 page 29 to 38.
// original downloaded from
// A fuller collection of even fancier classes also given in UReal.h.

My uncertain class has a value, standard deviation, degrees of freedom, and 16
uncertainty type flags - square, triangular, gaussian, exact etc

Depending on the type, for example, one might use the legendary

 Welch-Satterthwaite - see NIST Appendix A3 Appendix B-1.

or some other propagation of uncertainty).

But lets try to walk with the interval library for starters...


Paul A Bristow, Prizet Farmhouse, Kendal, Cumbria, LA8 8AB UK
+44 1539 561830 Mobile +44 7714 33 02 04


> -----Original Message-----
> From: boost-bounces_at_[hidden]
> [mailto:boost-bounces_at_[hidden]]On Behalf Of Ross Smith
> Sent: Wednesday, April 16, 2003 9:14 PM
> To: Boost mailing list
> Subject: Re: [boost] Interval Wrinkles
> On Wednesday, 16 April 2003 20:54, Paul A. Bristow wrote:
> >
> > If one is using intervals to hold measurement and computational
> > uncertainty, I don't feel this matters - though for purer
> > mathemetical applications you are certainly corrent.
> The interval library isn't useful for computations involving uncertain
> measurements, since it treats the interval as a square wave with rigid
> limits, not a gaussian distribution.
> --
> Ross Smith ......... r-smith_at_[hidden] ......... Auckland, New Zealand
> Our landscape raped by different armies
> Soldier-slaves who have no faces
> Control our ways and lives completely
> Our minds are torn, time left its traces
> -- L'Ame Immortelle
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