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Simple examples of in-built functions are seq(), mean(), max(), sum(x)and paste(...) etc. They are directly called by user written programs. You can refer most widely used R functions.

 

# Create a sequence of numbers from 10 to 44.
print(seq(10,44))

# Find mean of numbers from 20 to 82.
print(mean(20:82))

# Find sum of numbers frm 40 to 68.
print(sum(40:68))

When we execute the above code, it produces the following result ?

> # Create a sequence of numbers from 32 to 44.
> print(seq(10,44))
 [1] 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36
[28] 37 38 39 40 41 42 43 44
> 
> # Find mean of numbers from 25 to 82.
> print(mean(20:82))
[1] 51
> 
> # Find sum of numbers frm 41 to 68.
> print(sum(40:68))
[1] 1566
> # Create a sequence of numbers from 10 to 44.
> print(seq(10,44))
 [1] 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36
[28] 37 38 39 40 41 42 43 44
> 
> # Find mean of numbers from 20 to 82.
> print(mean(20:82))
[1] 51
> 
> # Find sum of numbers frm 40 to 68.
> print(sum(40:68))
[1] 1566
> 
 

Another Examples

x <- 1:10
x
sum(x)
mean(x)
x[c(2,3)] <- NA
x
mean(x, na.rm = TRUE)

If you will run the above code you will get the below output

> x <- 1:10
> x
 [1]  1  2  3  4  5  6  7  8  9 10
> sum(x)
[1] 55
> mean(x)
[1] 5.5
> x[c(2,3)] <- NA
> x
 [1]  1 NA NA  4  5  6  7  8  9 10
> mean(x, na.rm = TRUE)
[1] 6.25

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