# R – Operators

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**

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 <- 6b <- 8.4print (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+0iThe 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 <- 1b <- 0print (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

`# R program to illustrate` `# the use of Arithmetic 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 TRUEAny 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 : FALSECompares 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

`# 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

`# 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) ->> vec1print (vec1)Output : "ab" "TRUE"

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

## 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 <- 0.1list1 <- c(TRUE, 0.1,"apple")print (val %in% list1)Output : TRUEChecks 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 5Prints 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.

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

`# 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