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Learning Objectives

  • How to use the apply() function in R?
  • How to use the tapply() function in R?

apply( ) Function in R

  • Apply function is a set of loop functions in R
  • The main difference is that the apply functions are more efficient than a for loop
  • Apply function requires fewer lines of codes (less chance of coding error) and is often faster than the simpler loop

Syntax

The syntax for apply() function is:

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tapply( ) Function in R

  • tapply() computes a measure (mean, median, min, max, etc.) or a function for each factor variable in a vector.
  • It is a handy function that lets you create a subset of a vector and then apply some functions to each subset.

Syntax

The syntax for tapply() function is:

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