[Numpy-discussion] expm

Timothy Hochberg tim.hochberg@ieee....
Fri Jul 20 15:07:42 CDT 2007


On 7/20/07, Charles R Harris <charlesr.harris@gmail.com> wrote:

[SNIP]
>
>
> I expect using sqrt(x) will be faster than x**.5.
>

You might want to check that. I believe that x**0.5 is one of the magic
special cases that is optimized to run fast (by calling sqrt in this case).
IIRC the full set is [-1, 0, 0.5, 1, 2]. These were all of the ones that we
believed could be implemented without loosing accuracy relative to using
pow.



-- 
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