Message 96497 - Python tracker

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Author	mark.dickinson
Recipients	mark.dickinson, ned.deily, nirinA, rhettinger, steven.daprano, stutzbach, terry.reedy, tim.peters
Date	2009-12-16.20:40:34
SpamBayes Score	0.0002677405
Marked as misclassified	No
Message-id	<1260996036.32.0.672014686165.issue3366@psf.upfronthosting.co.za>
In-reply-to

Content
I committed the patch for expm1 in r76861 (trunk) and r76863 (py3k), with one small change: instead of using 2 * exp(x/2) * sinh(x/2), expm1 is now computed using a method due to Kahan that involves only exp and log. This seems a little safer, and guards against problems on platforms with a naive implementation of sinh. (I hope no such platforms exist, but suspect that's wishful thinking. :-) Thanks to Eric Smith for testing the build system changes on Windows.

I committed the patch for expm1 in r76861 (trunk) and r76863 (py3k), with 
one small change:  instead of using 2 * exp(x/2) * sinh(x/2), expm1 is now 
computed using a method due to Kahan that involves only exp and log.  This 
seems a little safer, and guards against problems on platforms with a 
naive implementation of sinh.  (I *hope* no such platforms exist, but 
suspect that's wishful thinking. :-)

Thanks to Eric Smith for testing the build system changes on Windows.

History
Date	User	Action	Args
2009-12-16 20:40:36	mark.dickinson	set	recipients: + mark.dickinson, tim.peters, rhettinger, terry.reedy, ned.deily, stutzbach, nirinA, steven.daprano
2009-12-16 20:40:36	mark.dickinson	set	messageid: <1260996036.32.0.672014686165.issue3366@psf.upfronthosting.co.za>
2009-12-16 20:40:35	mark.dickinson	link	issue3366 messages
2009-12-16 20:40:34	mark.dickinson	create