Applying a Function over an Object in R Programming - sapply() Function Last Updated : 19 Jun, 2020 Comments Improve Suggest changes Like Article Like Report sapply() function in R Language takes list, vector or data frame as input and gives output in vector or matrix. It is useful for operations on list objects and returns a list object of same length of original set. Syntax: sapply(X, FUN) Parameters: X: A vector or an object FUN: Function applied to each element of x Example 1: Python3 # R program to illustrate # sapply function # Getting the value of Biochemical oxygen # demand data set BOD # Calling sapply() function which # will sum the data of each columns # of BOD sapply(BOD, sum) Output: Time demand 1 1 8.3 2 2 10.3 3 3 19.0 4 4 16.0 5 5 15.6 6 7 19.8 Time demand 22 89 Example 2: Python3 # R program to illustrate # sapply function # Initializing a list mylist <- list(c(1, 2, 3, 4), c(2, 4, 6, 8), c(1, 3, 5, 7)) # Calling the sapply() function which # will calculate mean of each vector elements sapply(mylist, mean) Output: [1] 2.5 5.0 4.0 Comment More infoAdvertise with us Next Article Applying a Function over an Object in R Programming - sapply() Function K Kanchan_Ray Follow Improve Article Tags : R Language R DataFrame-Function R Vector-Function R Object-Function R Matrix-Function R List-Function +2 More Similar Reads Apply a Function over a Ragged Array in R Programming - tapply() Function tapply() function in R Language is used to apply a function over a subset of vectors given by a combination of factors Syntax: tapply(vector, factor, fun) Parameters: vector: Created Vector factor: Created Factor fun: Function to be applied Example 1: Python3 1== # R Program to apply a function # ov 1 min read Recursively apply a Function to a List in R Programming - rapply() function rapply() function in R Language is used to recursively apply a function to a list. 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