Function in R

A function is a set of codes which executes at a time and used to perform some actions

Function Syntax

Function Name

Function Body

Return Value

Input Values

Name                               Input          Body               ReturnValue

demo.function <- function(a)       {    b <- a^2           return(b)    }

Function Code snippet

#Function without input/output

Definition

emptyFunction <- function()

{

 print("hello")

}

Calling

emptyFunction()

#Function with input

demo.function <- function(a)

 {

   for(i in 1:a)

   {

      b <- i^2

      print(b)

 }

}       

demo.function(5)

# Function with return

demoReturn <- function()

{

        x <- 1

 z <- 2

 return(x)

 }

 sampleData <- demoReturn()

 sampleData

 # Function with input/output

demo.function <- function(a)

 {

      b <- a^2

     return(b)

}

sampleData <- demo.function(5)

sampleData

Recursive functions

recursive.factorial <- function(x)

{

   if (x == 0) { return (1)}

   else

   {return (x * recursive.factorial(x-1))}

}

recursive.factorial(5)