trim
인수의 0이 아닌 값에 대해 동일한 방법 mean
을 사용할 수 있습니다.
meanSub_g <- function(x, lower = 0, upper = 1){
Cutoffs <- quantile(x, probs = c(lower,upper))
return(mean(x[x >= Cutoffs[1] & x <= Cutoffs[2]]))
}
meanSub_j <- function(x, lower=0, upper=1){
if(isTRUE(all.equal(lower, 1-upper))) {
return(mean(x, trim=lower))
} else {
n <- length(x)
lo <- floor(n * lower) + 1
hi <- floor(n * upper)
y <- sort.int(x, partial = unique(c(lo, hi)))[lo:hi]
return(mean(y))
}
}
require(microbenchmark)
set.seed(21)
x <- rnorm(1e6)
microbenchmark(meanSub_g(x), meanSub_j(x), times=10)
# Unit: milliseconds
# expr min lq median uq max neval
# meanSub_g(x) 233.037178 236.089867 244.807039 278.221064 312.243826 10
# meanSub_j(x) 3.966353 4.585641 4.734748 5.288245 6.071373 10
microbenchmark(meanSub_g(x, .1, .7), meanSub_j(x, .1, .7), times=10)
# Unit: milliseconds
# expr min lq median uq max neval
# meanSub_g(x, 0.1, 0.7) 233.54520 234.7938 241.6667 272.3872 277.6248 10
# meanSub_j(x, 0.1, 0.7) 94.73928 95.1042 126.7539 128.6937 130.8479 10