search for: accurarte

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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 wh...