Most of the tasks in R are performed using functions. A function in R has the same utility as functions in Arithmetic.

In order to write a simple function in R, we must first open a new R script by navigating to **File** | **New file**.

We write a very simple function that accepts two values and adds them together. Copy and paste the code in the new blank R script:

add = function (x,y){ x+y }

A function in R should be defined by `function()`

. Once we define our function, we need to save it as a `.r`

file. Note that the name of the file should be the same as the function; hence we save our function with name `add.r`

.

In order to use the `add()`

function in the R command window, we need to source the file ...

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