Learn R : Common Numeric and Statistical functions you should know

    In this post, I am going to cover the common built-in numeric and basic statistical functions. All of the functions are coming with the base package so you don't need to add or install any packages to use them.

How to get absolute value of a number?

mynumber <- -90.91
abs(mynumber)

mynumbers <- c(-9, 0, 5, -4.5)
abs(mynumbers)

---

[1] 90.91
[1] 9.0 0.0 5.0 4.5

R-Fiddle

How to calculate square root?

mynumber <- 16
sqrt(mynumber)

mynumbers <- c(4,16,36)
sqrt(mynumbers)

---

[1] 4
[1] 2 4 6

R-Fiddle

How to get nearest integer?

mynumber <- 12.34
#this will give you nearest integer up
ceiling(mynumber)
#this will give you nearest integer down
floor(mynumber)

mynumbers <- c(2.3, 4.6, 1.5)
ceiling(mynumbers)
floor(mynumbers)

---

[1] 13
[1] 12
[1] 3 5 2
[1] 2 4 1

R-Fiddle

How to round an integer?

mynumber <- 90.94
round(mynumber)
round(mynumber,1)

---

[1] 91
[1] 90.9

R-Fiddle

How to find median value? (Middle of sorted list of numbers)

mynumbers <- c(1,3,8,14,24,34,47,53)
median(mynumbers)

---

[1] 19

R-Fiddle

How to find the range of array?

mynumbers <- c(49,35,4,20,68,10,34,92,68,9)
range(mynumbers)

---

[1]  4 92

R-Fiddle

Basic summary and finding minimum/maximum value of an array.

mynumbers <- c(2,5,10,20,50)
sum(mynumbers)
min(mynumbers)
max(mynumbers)

---

[1] 87
[1] 2
[1] 50

R-Fiddle

How to generate sequence of numbers?

myseq <- seq(0,100,10)
print(myseq)

---

 [1]   0  10  20  30  40  50  60  70  80  90 100

R-Fiddle

How to repeat the same value multiple times?

mynumbers <- rep(5, 10)
print(mynumbers)

---

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

R-Fiddle

How to sort array?

mynumbers <- c(34,89,23,45,10,29,73,49,1,55,83,99)
# This will give you the sorted index.
order(mynumbers)
# This will give you sorted value
mynumbers[order(mynumbers)]
# This will sort by desc
mynumbers[order(-mynumbers)]

---

 [1]  1 10 23 29 34 45 49 55 73 83 89 99
 [1] 99 89 83 73 55 49 45 34 29 23 10  1

R-Fiddle