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Remove Objects from Memory in R Programming - rm() Function

Remove Duplicate Elements from an Object in R Programming – unique() Function

Last Updated : 04 Jun, 2020

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unique() function in R Language is used to remove duplicated elements/rows from a vector, data frame or array.

Syntax: unique(x)

Parameters:
x: vector, data frame, array or NULL

Example 1:

   # R program to illustrate 
# unique function 
   
# Initializing some set of numbers 
x <- c(1:10, 5:9) 
x 
  
# Calling unique() function to print 
# unique set of numbers 
unique(x) 
 
  

Output:

  [1]  1  2  3  4  5  6  7  8  9 10  5  6  7  8  9  [1]  1  2  3  4  5  6  7  8  9 10

Example 2:

   # R program to illustrate 
# unique function 
    
# Initializing a matrix 
x <- matrix(rep(1:9, length.out = 18),  
            nrow = 6, ncol = 3, byrow = T) 
x 
   
# Calling unique() function to print 
# unique set of numbers in the matrix 
unique(x) 
 
  

Output:

       [, 1] [, 2] [, 3]  [1, ]    1    2    3  [2, ]    4    5    6  [3, ]    7    8    9  [4, ]    1    2    3  [5, ]    4    5    6  [6, ]    7    8    9         [, 1] [, 2] [, 3]  [1, ]    1    2    3  [2, ]    4    5    6  [3, ]    7    8    9

Remove Objects from Memory in R Programming - rm() Function

K

Kanchan_Ray

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Article Tags :

R Language
R DataFrame-Function
R Matrix-Function
R Object-Function
R Vector-Function

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