R - (Mathematical|Logical) Operators

# Addition
> 2+2
[1] 4
# Multiplication
> 2*3
[1] 6
# Division
> 4/2
[1] 2
# Power
> 2^3
[1] 8

?base::logic

• Not (!)

> !TRUE
[1] FALSE

Many operations in R are vectorized.

> x=1:4;y=6:3
> x
[1] 1 2 3 4
> y
[1] 6 5 4 3
# Logical
> x>2
[1] FALSE FALSE  TRUE  TRUE
> x>=2
[1] FALSE  TRUE  TRUE  TRUE
> y==1
[1] FALSE FALSE FALSE FALSE

?Comparison

The symbol ← and = are the assignment operator.

x <- 1

is equivalent to:

x = 1

Proof:

> x<-1
> y=1
> x==y
[1] TRUE

The : operator is used to create integer sequences.

> x=3:5
> x
[1] 3 4 5

R - Subset Operators (Extract or Replace Parts of an Object)