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