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