Here you will find daily news and tutorials about R, contributed by over 750 bloggers.
There are many ways to follow us - By e-mail:On Facebook: If you are an R blogger yourself you are invited to add your own R content feed to this site (Non-English R bloggers should add themselves- here)

Today we’re practising functions! In the exercises below, you’re asked to write short R scripts that define functions aimed at specific tasks. The exercises start at an easy level, and gradually move towards slightly more complex functions.

If you obtained a different solution than the one posted on the answers page, please let us know of your solution by posting it as a comment at the end of that page.

Exercise 1
Create a function that will return the sum of 2 integers.

Exercise 2
Create a function what will return TRUE if a given integer is inside a vector.

Exercise 3
Create a function that given a data frame will print by screen the name of the column and the class of data it contains (e.g. Variable1 is Numeric).

Exercise 4
Create the function unique, which given a vector will return a new vector with the elements of the first vector with duplicated elements removed.

Exercise 5
Create a function that given a vector and an integer will return how many times the integer appears inside the vector.

Exercise 6
Create a function that given a vector will print by screen the mean and the standard deviation, it will optionally also print the median.

Exercise 7
Create a function that given an integer will calculate how many divisors it has (other than 1 and itself). Make the divisors appear by screen.

Exercise 8
Create a function that given a data frame, and a number or character will return the data frame with the character or number changed to NA.