What is mapply in R?
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What is mapply in R?

What is mapply in R?

This recipe explains what is mapply in R

Recipe Objective

What is mapply in R? mapply () function is a multivariate type of sapply () function i.e mapply () accepts multiple arguments at a time. Syntax — **mapply (function,list)** function — a function like sum, etc is passed list — list of numbers on which the function will be applied This recipe demonstrates an example on mapply function..

Step 1 - Create a vector

a <- mapply(sum,1:10,1:10) # mapply sums up all the first elements, then second elements, and so on till the tenth elements. print(a)
"Output is ":  2  4  6  8 10 12 14 16 18 20 
a <- mapply(rep,1:10,10:1) # mapply repeats the first element 10 times, second element 9 times till the last element one time. print(a)
"Output is ": 
[[1]]
 [1] 1 1 1 1 1 1 1 1 1 1

[[2]]
[1] 2 2 2 2 2 2 2 2 2

[[3]]
[1] 3 3 3 3 3 3 3 3

[[4]]
[1] 4 4 4 4 4 4 4

[[5]]
[1] 5 5 5 5 5 5

[[6]]
[1] 6 6 6 6 6

[[7]]
[1] 7 7 7 7

[[8]]
[1] 8 8 8

[[9]]
[1] 9 9

[[10]]
[1] 10

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