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2004 Feb 24
6
be careful: using attach in R functions
...time usage.
Adding a ``detach()'' call at the end of ``f''
will get rid of this problem.
###############################
f <- function(){
theta <- list(one=2.0, two=0.3, three=0.4)
attach(theta)
x <- c(one, two, three)
sample(x, 1)
}
test <- function(n=400){
timeu <- numeric(n)
for(i in seq(n)){
timeu[i] <-
system.time({
resi <- f()
})[3]
}
plot(timeu)
}
test()
##############################
¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡Li Dongfeng
¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ldf-nospacm at math.pku.edu.cn
¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡2004-02-24