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cepces
2003 Nov 12
1
Power (^) 10x slower in R since version 1.7.1... What next?
...bit mantisa, the dll-provided pow function no longer
>returned integral values when both operands were integral. Now, I don't
>think that is a requiremnet of the standard but every other pow
>implementation I looked at did that. 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(...