On 01/11/2013 09:18 AM, Chris Hegarty wrote:
On 11/01/2013 16:57, Doug Lea wrote:
On 01/11/13 11:35, Peter Levart wrote:
On 01/11/2013 05:18 PM, Chris Hegarty wrote:
Now with explicit disclaimer on DoubleA*
"The order of accumulation within or across threads is not
guaranteed. Thus,
this class may not be applicable if numerical stability is required
when
combining values of substantially different orders of magnitude."
It doesn't have to be substantially different order of magnitude.
Thanks. Chris, please add "especially":
Hello,
I would prefer to cautionary note along the lines of "if you want
numerical accuracy, take care to use a summation algorithm with defined
worst-case behavior."
(Varying magnitude is not so much of a problem if you add things up in
the right order.)
-Joe
Thanks Doug, done.
-Chris.
"The order of accumulation within or across threads is not guaranteed.
Thus, this class may not be applicable if numerical stability is
required, especially when combining values of substantially different
orders of magnitude."
-Doug
