Re: Request for motion [Fwd: Input from IFIP WG 2.5 to IEEE Interval Standards Working Group]

[Dan Zuras Intervals <intervals08@xxxxxxxxxxxxxx>]

> Date: Thu, 10 Sep 2009 12:33:52 +0200
> From: Ulrich Kulisch <Ulrich.Kulisch@xxxxxxxxxxx>
> To: Ralph Baker Kearfott <rbk@xxxxxxxxxxxx>
> CC: stds-1788 <stds-1788@xxxxxxxxxxxxxxxxx>,
>         Nathalie Revol <Nathalie.Revol@xxxxxxxxxxx>, vladic@xxxxxxxx,
>         Ronald Boisvert <boisvert@xxxxxxxx>
> Subject: Re: Request for motion [Fwd: Input from IFIP WG 2.5 to IEEE Interval Standards Working Group]
> 
> Okay Baker,
> 
> I shall consider this. I am thinking to do it with Van Snyder who is a 
> member of the IFIP WG 2.5 and of the Fortran Standards Committee.
> 
> At the PPAM'09 meeting I could give a brief talk on motivation for the 
> IFIP WG 2.5 requirement if an overhead projector would be available.
> 
> With best regards
> Ulrich
> 

	Ulrich,

	If we are to pursue this at this time, please include accurate
	versions of all of sum, dot product, sum of squares, & sum of
	absolute values for all supported precisions.

	That the sum is needed is obvious.

	The sum of squares is needed for an accurate 2-norm & is
	different than calling dot product with the same argument
	twice in ways that are important in our context.

	The sum of absolute values is needed for a 1-norm & is pretty
	cheap once you have an accurate sum.

	Finally, let me caution you that how these things behave on
	empty & NaI elements may turn out to be important to this
	group.

	Thanks in advance if you decide to take this on,

	Yours,

				    Dan