Removed section on function that does not return value because we use that function later in the lesson. We don't users accidentally using the incorrect function.
Removed reference to debugging section. Skipping because R does not have the same issue with integer division.
Updated section on Testing and Documenting to use read.csv and also to focus on vectors instead of matrices.
Added rescale challenges along with answers.
Updated section on Defining Defaults.
Added answer to challenge of rescale function with arguments.
Updated Objectives and Key points.
read.table -> read.csv in R lesson 02.
parameter -> argument in novice R lesson 02.
Minor edits.
The answer to one of the challenges involves figures.