How can I create an infix

Question

I would like to have an infix operator %between% in R -- to check to see if x is between lower bound l and upper bound

Answer 1

You can define infix operators as functions:

`%between%`<-function(x,rng) x>rng[1] & x

As pointed out by @flodel, this operator is vectorized:

1:5 %between% c(1.5,3.5)
# [1] FALSE  TRUE  TRUE FALSE FALSE