Find a function `FUN`

that leads to the following output:

```
x <- 1:10
FUN(x) - FUN(-x)
```

`## [1] 11`

**Hint:** aim to keep the answer simple. The main logic of the function can often be summarized in a single line of R code.

##
**Answer 1: click to reveal**

We can write the function as follows:

```
FUN <- function(x) {
return(max(x))
}
```

Based on this definition of `FUN`

we get:

` FUN(x)`

` ## [1] 10`

` FUN(-x)`

` ## [1] -1`

We finally confirm that this function solves the puzzle:

` FUN(x) - FUN(-x)`

` ## [1] 11`

##
**Answer 2: click to reveal**

Another solution to this puzzle is:

```
FUN <- function(x) {
return(min(x))
}
```

Based on this definition of `FUN`

we get:

` FUN(x)`

` ## [1] 1`

` FUN(-x)`

` ## [1] -10`

We confirm that this function solves the puzzle:

` FUN(x) - FUN(-x)`

` ## [1] 11`

*For a full collection of R programming tutorials and exercises visit my website at codeRtime.org and the codeRtime YouTube channel*.