r - assign a value, if a number is in between two numbers

Question

Im trying to assign the value of -1, to every number in my vector that is inbetween 2 and 5. I thought an if - then statement would work. I am having some trouble. I dont think (2

x <- c(3.2,6,7.8,1,3,2.5)
if (2<x<5){
    cat(-1)
} else {
    cat (x)
}

Answer 1

There are a number of syntax error in your code.

Try using findInterval

x[findInterval(x, c(2,5)) == 1L] <- -1
x
## [1]  -1.0  6.0  7.8  1.0 -1.0 -1.0

read ?findInterval for more details on the use of findInterval

You could also use replace

replace(x, x > 2 & x < 5, -1)

Note that

• for 2<x<5 you need to write x > 2 & x < 5
• cat will output to the console or a file / connection. It won't assign anything.