Exercise

# Making your own functions

During the last 3 exercises, we have been using existing functions. However, you can also write your own functions. You can define a function using `function()`

code chunk. For instance, look at the code below to see a function that takes 2 parameters, `a`

and `b`

, sums them, and returns them.

```
sum_a_b <- function(a, b){
return (a + b)
}
```

You could call this function and assign its result to the variable `result`

, using the following code: `result = sum_a_b(4, 5)`

This would put the value of 9 into the variable `result`

. Off you go; now it's your turn !

Instructions

**100 XP**

- Look at the construction of the function
`sum_a_b`

. Make a similar function that multiplies a and b and call this`multiply_a_b`

- Call
`multiply_a_b`

with the values`a = 3`

and`b = 7`

and store the result into a variable called`result`