R - Operators - GeeksforGeeks

R – Operators

Last Updated : 21 Apr, 2020

Operators are the symbols directing the compiler to perform various kinds of operations between the operands. Operators simulate the various mathematical, logical and decision operations performed on a set of Complex Numbers, Integers, and Numericals as input operands. R supports majorly four kinds of binary operators between a set of operands. In this article, we will see various types of operators available in R and their usage.

Operators can be categorized based upon their different functionality:

Arithmetic Operators
Logical Operators
Relational Operators
Assignment Operators
Miscellaneous Operator

Arithmetic Operators

Arithmetic operations simulate various math operations, like addition, subtraction, multiplication, division and modulo using the specified operator between operands, which maybe either scalar values, complex numbers or vectors. The operations are performed element wise at the corresponding positions of the vectors.

Addition operator (+) : The values at the corresponding positions of both the operands are added. Consider the following R snippet to add two vectors:
```
Input : a <- c (1, 0.1)
        b <- c (2.33, 4)
        print (a+b)
Output : 3.33  4.10 
```
Subtraction Operator (-) : The second operand values are subtracted from the first. Consider the following R snippet to subtract two variables:
```
Input : a <- 6
        b <- 8.4
        print (a-b)
Output : -2.4 
```

Multiplication Operator (*) : The multiplication of corresponding elements of vectors and Integers are multiplied with the use of ‘*’ operator.


Input : B= matrix(c(4,6i),nrow=1,ncol=2) 
        C= matrix(c(2,2i ),nrow=1, ncol=2)
        print (B*C)
Output : 8+0i  -12+0i
The elements at corresponding positions of matrices are multiplied.

Division Operator (/) : The first operand is divided by the second operand with the use of ‘/’ operator.
```
Input : a <- 1
        b <- 0
        print (a/b)
Output : -Inf
```

Power Operator (^) : The first operand is raised to the power of the second operand.


Input : list1 <- c(2, 3)
        list2 <- c(2,4)
        print(list1^list2)
Output : 4  81

Modulo Operator (%%) : The remainder of the first operand divided by the second operand is returned.
```
Input : list1<- c(2, 3)
        list2<-c(2,4)
        print(list1%%list2)
Output : 0  3
```

The following R code illustrates the usage of all Arithmetic Operators in R:

# R program to illustrate 
# the use of Arithematic operators
vec1 <- c(0, 2)
vec2 <- c(2, 3)
  
# Performing operations on Operands
cat ("Addition of vectors :", vec1 + vec2, "\n")
cat ("Subtraction of vectors :", vec1 - vec2, "\n")
cat ("Multiplication of vectors :", vec1 * vec2, "\n")
cat ("Division of vectors :", vec1 / vec2, "\n")
cat ("Modulo of vectors :", vec1 %% vec2, "\n")
cat ("Power operator :", vec1 ^ vec2)

Output:

Addition of vectors : 2 5 
Subtraction of vectors : -2 -1 
Multiplication of vectors : 0 6 
Division of vectors : 0 0.6666667 
Modulo of vectors : 0 2 
Power operator : 0 8

Logical Operators

Logical operations simulate element-wise decision operations, based on the specified operator between the operands, which are then evaluated to either a True or False boolean value.Any non zero integer value is considered as a TRUE value, be it complex or real number.

Element-wise Logical AND operator (&) : Returns True if both the operands are True.


Input : list1 <- c(TRUE, 0.1)
        list2 <- c(0,4+3i)
        print(list1 & list2)
Output : FALSE   TRUE
Any non zero integer value is considered as a TRUE value, be it complex or real number.

Element-wise Logical OR operator (|) : Returns True if either of the operands are True.


Input : list1 <- c(TRUE, 0.1)
        list2 <- c(0,4+3i)
        print(list1|list2)
Output : TRUE  TRUE

NOT operator (!) : A unary operator that negates the status of the elements of the operand.
```
Input : list1 <- c(0,FALSE)
Output : TRUE  TRUE
```

Logical AND operator (&&) : Returns True if both the first elements of the operands are True.


Input : list1 <- c(TRUE, 0.1)
        list2 <- c(0,4+3i)
        print(list1 && list2)
Output : FALSE 
Compares just the first elements of both the lists.

Logical OR operator (||) : Returns True if either of the first elements of the operands are True.


Input : list1 <- c(TRUE, 0.1)
        list2 <- c(0,4+3i)
        print(list1||list2)
Output : TRUE

The following R code illustrates the usage of all Logical Operators in R:

# R program to illustrate 
# the use of Logical operators
vec1 <- c(0,2)
vec2 <- c(TRUE,FALSE)
  
# Performing operations on Operands
cat ("Element wise AND :", vec1 & vec2, "\n")
cat ("Element wise OR :", vec1 | vec2, "\n")
cat ("Logical AND :", vec1 && vec2, "\n")
cat ("Logical OR :", vec1 || vec2, "\n")
cat ("Negation :", !vec1)

Output:

Element wise AND : FALSE FALSE 
Element wise OR : TRUE TRUE 
Logical AND : FALSE 
Logical OR : TRUE 
Negation : TRUE FALSE

Relational Operators

The relational operators carry out comparison operations between the corresponding elements of the operands. Returns a boolean TRUE value if the first operand satisfies the relation compared to the second. A TRUE value is always considered to be greater than the FALSE.

Less than (<) : Returns TRUE if the corresponding element of the first operand is less than that of the second operand. Else returns FALSE.
```
Input :  list1 <- c(TRUE, 0.1,"apple")
         list2 <- c(0,0.1,"bat")
         print(list1<list2)
Output :  FALSE FALSE  TRUE
```
Less than equal to (<=) : Returns TRUE if the corresponding element of the first operand is less than or equal to that of the second operand.Else returns FALSE.
```
Input :  list1 <- c(TRUE, 0.1,"apple")
         list2 <- c(0,0.1,"bat")
         print(list<=list2)
Output : FALSE TRUE TRUE
```
Greater than (>) : Returns TRUE if the corresponding element of the first operand is greater than that of the second operand. Else returns FALSE.
```
Input :  list1 <- c(TRUE, 0.1,"apple")
         list2 list2)
Output : TRUE FALSE FALSE
```
Greater than equal to (>=) : Returns TRUE if the corresponding element of the first operand is greater or equal to than that of the second operand.Else returns FALSE.
```
Input :  list1 <- c(TRUE, 0.1,"apple")
         list2 =list2)
Output : TRUE TRUE FALSE
```
Not equal to (!=) : Returns TRUE if the corresponding element of the first operand is not equal to second operand.Else returns FALSE.
```
Input : list1 <- c(TRUE, 0.1,""apple")
        list2 <- c(0,0.1,"bat")
        print(list1!=list2)
Output : TRUE FALSE TRUE
```

The following R code illustrates the usage of all Relational Operators in R:

# R program to illustrate 
# the use of Relational operators
vec1 <- c(0, 2)
vec2 <- c(2, 3)
  
# Performing operations on Operands
cat ("Vector1 less than Vector2 :", vec1 < vec2, "\n")
cat ("Vector1 less than equal to Vector2 :", vec1 <= vec2, "\n")
cat ("Vector1 greater than Vector2 :", vec1 > vec2, "\n")
cat ("Vector1 greater than equal to Vector2 :", vec1 >= vec2, "\n")
cat ("Vector1 not equal to Vector2 :", vec1 != vec2, "\n")

Output:

Vector1 less than Vector2 : TRUE TRUE 
Vector1 less than equal to Vector2 : TRUE TRUE 
Vector1 greater than Vector2 : FALSE FALSE 
Vector1 greater than equal to Vector2 : FALSE FALSE 
Vector1 not equal to Vector2 : TRUE TRUE

Assignment Operators

Assignment operators are used to assign values to various data objects in R. The objects may be integers, vectors or functions. These values are then stores by the assigned variable names. There are two kinds of assignment operators: Left and Right

Left Assignment (<- or <<- or =) : Assigns value to a vector.


Input : vec1 = c("ab", TRUE) 
        print (vec1)
Output : "ab"   "TRUE"

Right Assignment (-> or ->>) :Assigns value to a vector.


Input : c("ab", TRUE) ->> vec1
        print (vec1)
Output : "ab"   "TRUE"

The following R code illustrates the usage of all Relational Operators in R:

# R program to illustrate 
# the use of Assignment operators
vec1 <- c(2:5)
c(2:5) ->> vec2
vec3 <<- c(2:5)
vec4 = c(2:5)
c(2:5) -> vec5
  
# Performing operations on Operands
cat ("vector 1 :", vec1, "\n")
cat("vector 2 :", vec2, "\n")
cat ("vector 3 :", vec3, "\n")
cat("vector 4 :", vec4, "\n")
cat("vector 5 :", vec5)

Output:

vector 1 : 2 3 4 5 
vector 2 : 2 3 4 5 
vector 3 : 2 3 4 5 
vector 4 : 2 3 4 5 
vector 5 : 2 3 4 5

Miscellaneous Operators

These are the mixed operators that simulate the printing of sequences and assignment of vectors, either left or right handedly.

%in% Operator: Checks if an element belongs to a list and returns a boolean value TRUE if the value is present else FALSE.


Input : val <- 0.1
        list1 <- c(TRUE, 0.1,"apple")
        print (val %in% list1)
Output : TRUE
Checks for the value 0.1 in the specified list. It exists, therefore, prints TRUE.

Colon Operator(:) : Prints a list of elements starting with the element before the color to the element after it.
```
Input :  print (1:5)
Output : 1 2 3 4 5
Prints a sequence of the numbers from 1 to 5.
```

%*% Operator: This operator is used to multiply a matrix with its transpose. Transpose of the matrix is obtained by interchanging the rows to columns and columns to rows. The number of columns of first matrix must be equal to number of rows of second matrix.Multiplication of the matrix A with its transpose, B, produce a square matrix.
$A_r_*_c x B_c*r -> P_r_*_r$


Input :  mat = matrix(c(1,2,3,4,5,6),nrow=2,ncol=3)
         print (mat)
         print( t(mat))
         pro = mat %*% t(mat)
         print(pro)
Output :     [,1] [,2] [,3]      #original matrix of order 2x3
        [1,]   1    3    5
        [2,]   2    4    6
             [,1] [,2]           #transposed matrix of order 3x2
        [1,]    1    2
        [2,]    3    4
        [3,]    5    6
             [,1] [,2]          #product matrix of order 2x2
        [1,]   35   44
        [2,]   44   56

The following R code illustrates the usage of all Miscellaneous Operators in R:

# R program to illustrate 
# the use of Miscellaneous operators
mat <- matrix (1:4, nrow = 1, ncol = 4)
print("Matrix elements using : ")
print(mat)
product = mat %*% t(mat)
print("Product of matrices")
print(product,)
cat ("does 1 exist in prod matrix :", "1" %in% product)

Output:

[1] "Matrix elements using : "
     [,1] [,2] [,3] [,4]
[1,]    1    2    3    4

[1] "Product of matrices"
     [,1]
[1,]   30

does 1 exist in prod matrix : FALSE

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