Скачать или смотреть S3,S4 objects systems in R|R Programming|SNS INSTITUTIONS

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In R, S3 and S4 refer to object-oriented programming (OOP) systems:

S3
1. *Generic functions*: S3 us seees generic functions, which dispatch methods based on the class of the object.
2. *Informal*: S3 is a more informal system, relying on naming conventions and function dispatch.
3. *Common use*: S3 is widely used in R packages and base R functions.

S4
1. *Formal classes*: S4 uses formal classes, which define the structure and behavior of objects.
2. *Multiple dispatch*: S4 supports multiple dispatch, allowing methods to be selected based on the classes of multiple arguments.
3. *More rigorous*: S4 is a more formal and rigorous system, providing more control over object behavior.

Key differences
1. *Formality*: S3 is more informal, while S4 is more formal and structured.
2. *Dispatch mechanism*: S3 uses single dispatch, while S4 supports multiple dispatch