Advanced Object-oriented Programming In R: Stat... -
S3 is R’s original, informal OOP system. It is essentially a list with a "class" attribute.
The first step in strategic selection is understanding the fundamental divide in R’s approach to objects: Advanced Object-Oriented Programming in R: Stat...
S4 is a more formal version of S3, requiring explicit class definitions with "slots" and typed data. S3 is R’s original, informal OOP system