Titlebook: R Quick Syntax Reference; Margot Tollefson Book 20141st edition Margot Tollefson 2014

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Modes of Objectsamming. S3 is the preceding version. Both versions run concurrently. S4 offers powerful new methods, but to use those methods a solid knowledge of S3 is necessary. This book focuses mainly on S3 methods, including S4 syntax where appropriate.

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Classes of Objectsclasses. In S3, there are specific classes into which an R objects falls. In S4, the user defines a class for an S4 object. Classes in S3 are called informal classes, whereas classes in S4 are called formal classes. This chapter covers only S3 classes.