[Numpy-discussion] Slightly off-topic - accuracy of C exp function?

Matthew Brett matthew.brett at gmail.com
Wed Apr 23 01:22:36 EDT 2014


I'm exploring Mingw-w64 for numpy building, and I've found it gives a
slightly different answer for 'exp' than - say - gcc on OSX.

The difference is of the order of the eps value for the output number
(2 * eps for a result of ~2.0).

Is accuracy somewhere specified for C functions like exp?  Or is
accuracy left as an implementation detail for the C library author?



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