Message 406866 - Python tracker

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Author	rhettinger
Recipients	mark.dickinson, rhettinger, steven.daprano
Date	2021-11-23.17:33:42
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<1637688823.02.0.220992157747.issue45876@roundup.psfhosted.org>
In-reply-to

Content
> It wouldn't be hard to go for _always_ correctly rounded > and actually get it over. Yes, that would be the right thing to do. Does the technique you had in mind involve testing 1 ulp up or down to see whether its square is closer to the input? > an Emax of 999 and an Emin of -999 would already be > more than big enough. Right. In haste, I confused max_exp=1024 with max_10_exp=308. Am still thinking that the precision needs to be bumped up a bit the 28 place default.

> It wouldn't be hard to go for _always_ correctly rounded 
> and actually get it over.

Yes, that would be the right thing to do.

Does the technique you had in mind involve testing 1 ulp up or down to see whether its square is closer to the input?


> an Emax of 999 and an Emin of -999 would already be 
> more than big enough.

Right. In haste, I confused max_exp=1024 with max_10_exp=308.  

Am still thinking that the precision needs to be bumped up a bit the 28 place default.

History
Date	User	Action	Args
2021-11-23 17:33:43	rhettinger	set	recipients: + rhettinger, mark.dickinson, steven.daprano
2021-11-23 17:33:43	rhettinger	set	messageid: <1637688823.02.0.220992157747.issue45876@roundup.psfhosted.org>
2021-11-23 17:33:43	rhettinger	link	issue45876 messages
2021-11-23 17:33:42	rhettinger	create