SAVOR: Part I

R brush-up

RStudio project setup

0. Start by opening RStudio and create a new project

Functions

1. Print function
   Let’s start by writing a function that will print its one argument (e.g. 2).

myprint(2)

## [1] 2

2. Default arguments Let’s now add a default value to this function’s argument

Control structures

3. for loop
   Now consider the following data.frame:

first_name	last_name	gender
Hermione	Granger	female
Ron	Weasley	male
Harry	Potter	male

Write a function that takes such a data.frame as a argument and that will print the last name for each row.

4. while statement
   Now write the same function using a while statement.

5. if/else statement
   Finally, write a function that will print the last name for females and the first name for males.

There are only two hard things in Computer Science:

• cache invalidation, and
• naming things.

– Phil Karlton