消息 [70228] - Python tracker

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作者	rhettinger
收信人	fredrikj, loewis, rhettinger
日期	2008-07-24.21:39:56
SpamBayes Score	0.25514093
Marked as misclassified	否
Message-id	<1216935598.26.0.118628105023.issue3439@psf.upfronthosting.co.za>
In-reply-to

内容
Another reason to leave frexp() untouched is that it is tightly coupled to ldexp() as its inverse, for a lossless roundtrip: assert ldexp(frexp(pi)) == pi This relationship is bound to get mucked-up or confused if frexp starts accepting large integers that are no exactly representable as floats (i.e. 2*100+1).

Another reason to leave frexp() untouched  is that it is tightly 
coupled to ldexp() as its inverse, for a lossless roundtrip:

  assert ldexp(*frexp(pi)) == pi

This relationship is bound to get mucked-up or confused if frexp starts 
accepting large integers that are no exactly representable as floats 
(i.e. 2**100+1).

历史
日期	用户	动作	参数
2008-07-24 21:39:58	rhettinger	修改	spambayes_score: 0.255141 -> 0.25514093 recipients: + rhettinger, loewis, fredrikj
2008-07-24 21:39:58	rhettinger	修改	spambayes_score: 0.255141 -> 0.255141 messageid: <1216935598.26.0.118628105023.issue3439@psf.upfronthosting.co.za>
2008-07-24 21:39:57	rhettinger	链接	issue3439 messages
2008-07-24 21:39:56	rhettinger	创建