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rdate-sorting

Delete values from a sorted vector

I have a vector of 100 sorted values

x=rnorm(100)
x_sort=sort(x)

How can I delete 2.5% (for example) from upper un lower side of x_sort?

Solution

  • Here's one option:

    m <- 5 # percentage to be deleted from each side
l <- length(x_sort)
n <- l * m/100
y <- head(tail(x_sort, l - n), l - n*2)

length(x_sort)
#[1] 100
length(y)
#[1] 90

    You could round the value of n to integers or use floor or ceiling functions, e.g. n <- round(l * m/100) to ensure that you're not trying to remove for example 2.3 elements of x.

    Another approach:

    m <- 5 # percentage to be deleted from each side
l <- length(x_sort)
n <- round(l * m/100)
y2 <- x_sort[seq.int(n+1L, l-n, 1L)]

    Do they return the same?

    all.equal(y, y2)
#[1] TRUE