Message 61442 - Python tracker

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In-reply-to
Author	mark.dickinson
Recipients	Rhamphoryncus, christian.heimes, gmcastil, mark.dickinson, tim.peters
Date	2008年01月21日.19:39:53
SpamBayes Score	0.041157287
Marked as misclassified	No
Message-id	<1200944398.27.0.876465371891.issue1640@psf.upfronthosting.co.za>

Content
Also, for the C-level routines, atanh(1.0) and atanh(-1.0) should definitely return infinity and -infinity (and probably set errno as well.) Note that this is not an argument about what Python should do: Python will still raise a ValueError for atanh(1.0) and atanh(-1.0). But the atanh is supposed to be a drop-in replacement for the libm atanh, on those platforms where it's missing. And the C99 standard is clear about return values, even though it's not useful when it comes to deciding whether to set errno or not.

Content

Also, for the C-level routines, atanh(1.0) and atanh(-1.0) should definitely return 
infinity and -infinity (and probably set errno as well.)
Note that this is not an argument about what Python should do: Python will still raise a 
ValueError for atanh(1.0) and atanh(-1.0). But the atanh is supposed to be a drop-in 
replacement for the libm atanh, on those platforms where it's missing. And the C99 
standard is clear about return values, even though it's not useful when it comes to 
deciding whether to set errno or not.

History
Date	User	Action	Args
2008年01月21日 19:39:58	mark.dickinson	set	spambayes_score: 0.0411573 -> 0.041157287 recipients: + mark.dickinson, tim.peters, Rhamphoryncus, christian.heimes, gmcastil
2008年01月21日 19:39:58	mark.dickinson	set	spambayes_score: 0.0411573 -> 0.0411573 messageid: <1200944398.27.0.876465371891.issue1640@psf.upfronthosting.co.za>
2008年01月21日 19:39:53	mark.dickinson	link	issue1640 messages
2008年01月21日 19:39:53	mark.dickinson	create

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