Check which elements of a vector is between the elements of another one in R

Question

I am new user in R. How can I check which elements of the vector A is between the elements of vector B for example:

    A = c(1.1,          


        

Answer 1

You want some variant of findInterval

findInterval(A,B)
[1] 1 3 3 3 3 2

Value 1 indicates it is between 1 and 2 (the lowest and next lowest value in B) Value 2 indicates it is between 2 and 3

So to find which ones are between

which(findInterval(A,B) %in% seq_len(length(unique(B))-1))
# [1] 1 6

and to extract from A

A[findInterval(A,B) %in% seq_len(length(unique(B))-1)]

# [1] 1.1 2.2

You could also use cut, which will create a factor.

In conjunction with split this will give

 split(A, cut(A,B),drop=FALSE)
$`(1,2]`
[1] 1.1

$`(2,3]`
[1] 2.2