Apply a Function over a Ragged Array in R Programming - tapply() Function

Last Updated : 15 Jul, 2025
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
# over a data object

# Creating Factor
fac <- c(1, 1, 1, 1, 2, 2, 2, 3, 3)

# Created Vector
vec <- c(1, 2, 3, 4, 5, 6, 7, 8, 9) 

# Calling tapply() Function
tapply(vec, fac, sum)
Output: 
 1  2  3 
10 18 17
This is how above code works:   Example 2: Python3 1== 
# R Program to apply a function
# over a data object

# Creating Factor
fac <- c(1, 1, 1, 1, 2, 2, 2, 3, 3)

# Created Vector
vec <- c(1, 2, 3, 4, 5, 6, 7, 8, 9) 

# Calling tapply() Function
tapply(vec, fac, prod)
Output: 
 1   2   3 
24 210  72
Comment

Explore