[R] ^ operation much slower in R 1.7.1 than in R 1.7.0 ???

[Charles Annis, P.E.]

Nearly 5X slower on DELL Pentium 4, 2.26GHz, 1Gig, WinXP-Pro 

..........
R : Copyright 2003, The R Development Core Team
Version 1.7.0  (2003-04-16)

> a <- abs(matrix(rnorm(800*800)/2, ncol=800, nrow=800)) 
> system.time(b <- a^1000)[3]
[1] 0.68
> 
..........
R : Copyright 2003, The R Development Core Team
Version 1.7.1  (2003-06-16)
> a <- abs(matrix(rnorm(800*800)/2, ncol=800, nrow=800)) 
> system.time(b <- a^1000)[3]
[1] 3.29
>


Charles Annis, P.E.

Charles.Annis at StatisticalEngineering.com
phone: 561-352-9699
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