What is sapply in R?

What is sapply in R?

What is sapply in R?

This recipe explains what is sapply in R


Recipe Objective

What is sapply in R? sapply function takes a vector as an input and provides output in a vector or matrix form. Syntax — **sapply (x,function)** x — input vector function — function which is to be applied on the input sapply () function is used instead of a for loop for iterating over a list or a vector. This recipe demonstrates an example using sapply function.

Step 1 - Create a vector

sapply(1:20,function(i) i + 5) #Using sapply()
"Output is": 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

Step 2 - Create a list

Using sapply() on a list for calculating sum of the elements with sum function.

list1 <- list(a <- c(1,2,3,4,5)) sapply(list1,sum)
"Output is": 15 

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