[R] Comparison of the amount of computation

[helin_susam]

Hi dear list,

I want to compare the amount of computation of two functions. For example,
by using this algorithm;

data <- rnorm(n=100, mean=10, sd=3)

output1 <- list ()
for(i in 1:100) {
data1 <- sample(100, 100, replace = TRUE)
statistic1 <- mean(data1)
output1 <- c(output1, list(statistic1))
}
output1

output2 <- list()
for(i in 1:100) {
data2 <- unique(sample(100, 100, replace=TRUE))
statistic2 <- mean(data2)
output2 <- c(output2, list(statistic2))
}
output2

data1 consists of exactly 100 elements, but data2 consists of roughly 55 or
60 elements. So, to get statistic1, for each sample, 100 data points are
used. But, to get statistic2 roughly half of them are used.
I want to proof this difference. Is there any way to do this ? May be R has
a property about this process such as Rprof, i tried use but i could not
sure. 

Thans for any help !

Regards,
Helin.

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