sum of S4 objects in R...

Class slots vs. initialize signature mismatch...

which type of object to use for assigning several s4 class objects to it?...

Why is it not recommended to use multiple inheritance?...

Define a show method for an S3 class...

How to write coercion methods...

Efficient way to define a class with multiple, optionally-empty slots in S4 of R?...

is.object and the S3 class system...

S4 constructors and prototypes...

How to set default value of a slot as NULL in R?...

dispatching S4 methods with an expression as argument...

Recognizing a S3 (?) class from a package in an S4 class definition...

Problems passing arguments with callNextMethod() in R...

Programmatically distinguishing S3 and S4 objects in R...

How do you get S3 methods to work with S4 objects?...