# How to remove the first replicate in a vector using another vector that contains similar elements in R?

R ProgrammingServer Side ProgrammingProgramming

To remove the first replicate in a vector using another vector, we can use match function. For example, if we have a vector x that contain values 0, 1, 2, 3, 4, 5 and 0, 1, 2 are repeated in another vector say then the removal of this replicate will result in values 3, 4, and 5. This can be done by using x[-match(y,x)].

## Example

Live Demo

x1<-0:5
x1

## Output

[1] 0 1 2 3 4 5

## Example

Live Demo

y1<-0:2
y1

## Output

[1] 0 1 2

## Example

x1[-match(y1,x1)]

## Output

[1] 3 4 5

## Example

Live Demo

x2<-sample(0:5,120,replace=TRUE)
x2

## Output

[1]   0 3 3 4 3 0 4 2 1 3 0 2 0 1 3 1 5 2 3 1 1 2 5 2 0 0 3 1 3 0 3 0 0 0 3 2 4
[38]  0 0 2 5 5 0 1 3 1 2 5 5 2 2 4 1 5 3 3 3 4 1 4 0 1 4 1 3 3 4 0 1 1 0 3 1 4
[75]  5 2 5 1 3 4 3 3 1 3 3 2 1 2 3 4 0 1 1 5 4 0 4 1 3 0 0 0 2 1 3 2 4 5 2 5 3
[112] 5 0 4 5 4 1 0 0 2

## Example

Live Demo

y2<-sample(0:2,120,replace=TRUE)
y2

## Output

[1]   2 1 1 1 0 0 1 1 1 0 1 0 0 1 2 2 1 0 2 0 0 1 2 1 0 2 1 0 2 0 2 0 2 2 2 0 1
[38]  2 2 0 0 0 1 2 2 1 2 1 2 2 1 0 1 0 0 1 2 1 0 2 2 2 0 0 0 2 0 0 1 2 0 2 1 2
[75]  1 2 1 2 1 2 1 2 2 0 1 2 1 2 0 0 0 0 0 0 1 1 2 1 1 0 0 2 2 1 2 0 1 0 2 0 0
[112] 2 0 2 0 0 2 0 1 1

## Example

x2[-match(y2,x2)]

## Output

[1]   3 3 4 3 0 4 3 0 2 0 1 3 1 5 2 3 1 1 2 5 2 0 0 3 1 3 0 3 0 0 0 3 2 4 0 0 2
[38]  5 5 0 1 3 1 2 5 5 2 2 4 1 5 3 3 3 4 1 4 0 1 4 1 3 3 4 0 1 1 0 3 1 4 5 2 5
[75]  1 3 4 3 3 1 3 3 2 1 2 3 4 0 1 1 5 4 0 4 1 3 0 0 0 2 1 3 2 4 5 2 5 3 5 0 4
[112] 5 4 1 0 0 2

## Example

Live Demo

x3<-sample(1:10,120,replace=TRUE)
x3

## Output

[1]    5 4 5 1 5 1 8 10 7 3 6 4 2 5 7 9 8 8 7 8 1 6 10 1 9
[26]   4 1 3 4 1 5 1 3 4 6 3 1 3 6 8 3 9 10 7 5 7 5 4 8 9
[51]   8 6 10 8 1 9 5 9 2 3 4 9 5 7 3 10 5 4 8 8 6 10 3 1 8
[76]   2 1 9 10 9 10 10 9 8 5 7 9 5 4 10 10 10 5 6 10 7 10 5 9 7
[101] 10 1 4 5 2 4 1 3 5 4 5 9 9 5 9 5 5 9 7 4

## Example

Live Demo

y3<-sample(1:5,120,replace=TRUE)
y3

## Output

[1]   3 1 4 4 2 1 5 5 5 1 1 2 5 5 3 1 4 5 4 1 2 1 2 5 5 3 2 4 4 5 1 2 1 2 5 5 3
[38]  1 3 1 1 1 1 3 5 5 5 2 1 4 2 1 5 4 2 4 2 1 3 1 4 2 1 2 4 2 3 3 3 5 3 4 1 2
[75]  3 3 4 4 5 2 2 1 1 4 3 2 3 1 3 1 1 5 2 5 1 1 1 1 5 2 5 5 2 3 4 4 4 4 3 2 3
[112] 4 5 3 2 2 4 4 2 4

## Example

x3[-match(y3,x3)]

## Output

[1]   5 5 1 8 10 7 6 4 5 7 9 8 8 7 8 1 6 10 1 9 4 1 3 4 1
[26]  5 1 3 4 6 3 1 3 6 8 3 9 10 7 5 7 5 4 8 9 8 6 10 8 1
[51]  9 5 9 2 3 4 9 5 7 3 10 5 4 8 8 6 10 3 1 8 2 1 9 10 9
[76] 10 10 9 8 5 7 9 5 4 10 10 10 5 6 10 7 10 5 9 7 10 1 4 5 2
[101] 4 1 3 5 4 5 9 9 5 9 5 5 9 7 4

## Example

Live Demo

x4<-sample(1:20,120,replace=TRUE)
x4

## Output

[1]  10 9 3 15 2 7 5 2 14 3 6 7 11 14 20 20 13 20 13 20 6 4 11 5 4
[26] 10 19 8 5 3 12 17 10 10 15 8 16 6 18 8 4 16 13 7 2 2 12 18 9 13
[51] 12 12 6 11 10 7 5 12 10 5 8 11 8 7 11 9 18 8 17 20 3 4 8 3 8
[76] 17 5 11 14 10 4 12 5 20 17 18 16 6 4 7 2 4 10 1 5 14 13 6 3 9
[101] 2 15 14 13 16 10 9 20 5 1 10 16 3 11 16 9 20 8 19 9

## Example

Live Demo

y4<-sample(1:10,120,replace=TRUE)
y4

## Output

[1]   4 9 1 10 2 8 4 3 7 7 8 5 10 2 10 5 9 4 5 8 3 4 7 3 5
[26]  7 2 8 5 4 3 5 8 5 1 10 4 3 7 6 4 10 2 1 9 7 9 8 10 5
[51]  6 1 8 5 5 6 3 7 6 8 5 3 8 7 6 5 6 5 10 7 10 1 5 3 2
[76]  2 5 9 9 7 5 2 9 4 10 7 5 6 8 7 4 10 8 7 6 7 9 5 10 8
[101] 9 1 1 8 5 2 1 4 4 8 7 8 1 1 2 7 8 1 5 7

## Example

x4[-match(y4,x4)]

## Output

[1]   15 2 14 3 7 11 14 20 20 13 20 13 20 6 11 5 4 10 19 5 3 12 17 10 10
[26]  15 8 16 6 18 8 4 16 13 7 2 2 12 18 9 13 12 12 6 11 10 7 5 12 10
[51]   5 8 11 8 7 11 9 18 8 17 20 3 4 8 3 8 17 5 11 14 10 4 12 5 20
[76]  17 18 16 6 4 7 2 4 10 5 14 13 6 3 9 2 15 14 13 16 10 9 20 5 1
[101] 10 16 3 11 16 9 20 8 19 9

## Example

Live Demo

x5<-rpois(120,5)
x5

## Output

[1]   5 6 7 3 6 9 3 5 3 7 2 5 5 4 7 7 6 2 5 7 6 7 8 4 6
[26]  1 2 6 3 3 5 6 4 8 3 5 2 9 4 6 4 6 2 3 11 6 6 8 4 5
[51] 11 4 8 5 4 4 5 1 5 5 5 8 3 7 2 8 3 4 3 5 5 5 4 3 4
[76]  5 2 8 7 5 6 4 3 3 3 7 0 7 3 4 3 5 8 7 12 5 8 2 7 3
[101] 4 10 1 4 3 5 1 8 6 6 4 12 5 4 3 3 1 6 11 5

## Example

Live Demo

y5<-rpois(120,3)
y5

## Output

[1]   3 7 2 2 5 1 5 4 1 5 1 5 3 3 6 3 4 2 5 4 2 6 0 4 5 1 4 5 3 3 4 3 4 2 1 7 4
[38]  5 5 2 3 4 8 4 5 3 3 2 0 7 1 0 4 6 3 3 3 4 5 1 1 2 3 4 5 3 2 2 5 3 0 7 2 1
[75]  5 3 2 1 4 3 5 2 0 6 4 4 0 3 0 5 2 3 1 3 2 3 2 4 4 2 4 4 4 2 1 2 4 2 4 3 2
[112] 4 5 6 3 1 4 2 2 4

## Example

x5[-match(y5,x5)]

## Output

[1]   6 9 3 5 3 7 5 5 7 7 6 2 5 7 6 7 4 6 2 6 3 3 5 6 4
[26]  8 3 5 2 9 4 6 4 6 2 3 11 6 6 8 4 5 11 4 8 5 4 4 5 1
[51]  5 5 5 8 3 7 2 8 3 4 3 5 5 5 4 3 4 5 2 8 7 5 6 4 3
[76]  3 3 7 7 3 4 3 5 8 7 12 5 8 2 7 3 4 10 1 4 3 5 1 8 6
[101] 6 4 12 5 4 3 3 1 6 11 5
Published on 17-Oct-2020 07:00:43