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accurarte
2003 Nov 12
1
Power (^) 10x slower in R since version 1.7.1... What next?
...hat. So I changed to a well-tested
>pow function (from the Cepehes math library) that did. As you found out
>it is expensive.
>I have written another pow function that use exp2 and log2 library
functions
>rather than the polynomial expansion used by Cephes package. It seems to
be
>accurarte enough (except when the result of pow is near 1.0 (eg,
pow(1.00001, 0.99999))
>and is as fast as the msvcrt.dll version. I still need to tweak for cass
>near range boundaries.
>The other alternative is to write a wrapper for the wrapper for the dll
pow,
>to fix up the special cases w...