Week 2: Foundations of R Programming

Main reference

• 4-8, Advanced R

What you will learn this week

• Subsetting
• Control flow
• Functions
• Environments
• Conditions

Pre-class activities

• Watch the following series of short videos on subsetting in R:

  • Subsetting R objects: Basics
  • Subsetting R objects: Lists
  • Subsetting R objects: Matrices
  • Subsetting R objects: Partial matching
  • Subsetting R objects: Removing missing values

• Write a function linear, that takes arguments x, a and b, and returns a + b * x. Give default values a=0 and b=1, and make sure your function has sensible error messages when the inputs are not as expected. Your function should work when x is a numerical scalar, vector, or matrix.

Slides for week

Download pdf

Solutions to class exercises

Assignments

• Assignment 1 is due on Tuesday 31 March.