[R] Calculation

This post covers how to perform calculations in R Studio.

1. Preparation

First, note that string variables are unable to compute.

Also, only variables that have the same cases of value can be computed.

Before any computation, let's make a couple of variables as follows.

If you do not know how to generate variables, refer to the link below.

https://ik-lab.blogspot.com/2022/06/r-studio-variable-generation.html

As long as the variables are not string variables, they can be computed with arithmetic operations as follows.

#preparation
a <- c(1:5)
b <- c(2:6)
a
b

#Console window
> a
[1] 1 2 3 4 5
> b
[1] 2 3 4 5 6

2. Addition

For addition, '+' is used.

#Addition
a+1
a+b

#Console window
> a+1
[1] 2 3 4 5 6
> a+b
[1]  3  5  7  9 11

3. Subtraction

For subtraction, '-' is used.

#Subtraction
a-1
a-b

#Console window
> a-1
[1] 0 1 2 3 4
> a-b
[1] -1 -1 -1 -1 -1

4. Multiplication

For multiplication, '*' is used.

#Multiplication
2*a
a*2
a*b

#Console window
> 2*a
[1]  2  4  6  8 10
> a*2
[1]  2  4  6  8 10
> a*b
[1]  2  6 12 20 30

5. Division

For division, '/' is used.

#Division
4/a
a/4
a/b

#Console window
> 4/a
[1] 4.000000 2.000000 1.333333 1.000000 0.800000
> a/4
[1] 0.25 0.50 0.75 1.00 1.25
> a/b
[1] 0.5000000 0.6666667 0.7500000 0.8000000 0.8333333

6. Factorial

For factorial, factorial() function is used.

#Factorial
factorial(4)
factorial(a)

#Console window
> factorial(4)
[1] 24
> factorial(a)
[1]   1   2   6  24 120

7. Square root

For square roots, sqrt() function is used.

#Square root
sqrt(16)
sqrt(a)

#Console window
> sqrt(16)
[1] 4
> sqrt(a)
[1] 1.000000 1.414214 1.732051 2.000000 2.236068