Message 59066 - Python tracker

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Author	tim.peters
Recipients	falk_steinhauer, mark.dickinson, tim.peters
Date	2007-12-31.22:56:52
SpamBayes Score	0.45163876
Marked as misclassified	No
Message-id	<1199141813.19.0.127166448497.issue1694@psf.upfronthosting.co.za>
In-reply-to

Content
Nice example! Yes, the round() implementation is numerically naive, in this particular case ignoring that x+0.5 isn't necessarily representable (it multiplies the input by 10.0, adds 0.5, takes the floor, then divides by 10.0, and in this specific case adding 0.5 loses information to rounding: >>> 5629499534213125 + 0.5 5629499534213126.0 ).

Nice example!  Yes, the round() implementation is numerically naive, in
this particular case ignoring that x+0.5 isn't necessarily representable
(it multiplies the input by 10.0, adds 0.5, takes the floor, then
divides by 10.0, and in this specific case adding 0.5 loses information
to rounding:

>>> 5629499534213125 + 0.5
5629499534213126.0

).

History
Date	User	Action	Args
2008-01-01 14:47:31	christian.heimes	unlink	issue1694 messages
2007-12-31 22:56:53	tim.peters	set	spambayes_score: 0.451639 -> 0.45163876 recipients: + tim.peters, mark.dickinson, falk_steinhauer
2007-12-31 22:56:53	tim.peters	set	spambayes_score: 0.451639 -> 0.451639 messageid: <1199141813.19.0.127166448497.issue1694@psf.upfronthosting.co.za>
2007-12-31 22:56:53	tim.peters	link	issue1694 messages
2007-12-31 22:56:52	tim.peters	create