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 !

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

Exercise

Making your own functions

Instructions