Get Indices of Specified Values of an Array in R Programming - arrayInd() Function

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

Last Updated : 19 Jun, 2020

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

Get Indices of Specified Values of an Array in R Programming - arrayInd() Function

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