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Types of Functions in R
Function with No Argument, No Return ValueFunction with No Argument, With Return ValueFunction with Argument, No Return ValueFunction with Argument, With Return Value
Function Components
The different parts of a function are −
Function Name− This is the actual name of the function. It is stored in R environment as an object with this name.Arguments− An argument is a placeholder. When a function is invoked, you pass a value to the argument. Arguments are optional; that is, a function may contain no arguments. Also arguments can have default values.Function Body− The function body contains a collection of statements that defines what the function does.Return Value− The return value of a function is the last expression in the function body to be evaluated.
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function_name = function(arg_1, arg_2, ...)
{
Function body
}
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# Create a sequence of numbers from 32 to 44.
print(seq(10))
print(seq(2,10))
print(seq(2,10,2))
# Find mean of numbers from 25 to 82.
print(mean(10:20))
# Find sum of numbers frm 41 to 68.
print(sum(1:10))
[1] 1 2 3 4 5 6 7 8 9 10 [1] 2 3 4 5 6 7 8 9 10 [1] 2 4 6 8 10 [1] 15 [1] 55
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Fun=function()
{
print("Hello")
}
Fun()
[1] "Hello"
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Fun=function(a)
{
print("Hello")
print(a)
}
Fun(10)
[1] "Hello" [1] 10
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Fun=function()
{
print("Hello")
return("Itronix")
}
a=Fun()
print(a)
[1] "Hello" [1] "Itronix"
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Fun=function(a)
{
print("Hello")
print(a)
return(20)
}
a=Fun(10)
print(a)
[1] "Hello" [1] 10 [1] 20
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Fun = function(a,b,c)
{
result = a * b + c
print(result)
}
Fun(5,3,11)
Fun(a = 11, b = 5, c = 3)
[1] 26 [1] 58
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Fun = function(a=10,b=6)
{
result = a * b
print(result)
}
Fun()
Fun(a = 11, b = 5)
[1] 60 [1] 55
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Add=function(a,b)
{
result=a+b
print(result)
return(a+b)
}
Fact=function(n)
{
f=1
for(i in 1:n)
{
f=f*i
}
print(f)
}
c=Add(3,2)
Fact(c)
[1] 5 [1] 120
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