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How to replace a value in an R vector?
To replace a value in an R vector, we can use replace function. It is better to save the replacement with a new object, even if you name that new object same as the original, otherwise the replacements will not work with further analysis. As you can see in the object x5(in examples), when we replaced 5 with 3, the previous replacement of -1 with 0 returned as in original vector. Therefore, we should save it in a new object.
Examples
> x1<-1:10 > x1
Output
[1] 1 2 3 4 5 6 7 8 9 10
> replace(x1,x1==5,10)
Output
[1] 1 2 3 4 10 6 7 8 9 10
Example
> x2<-sample(0:5,50,replace=TRUE) > x2
Output
[1] 1 4 5 3 3 0 0 3 4 2 1 1 1 1 2 0 2 1 5 3 5 2 3 0 3 0 4 2 4 1 3 2 4 2 3 1 4 4 [39] 1 0 3 2 4 2 1 1 1 2 5 1
> replace(x2,x2==0,1)
Output
[1] 1 4 5 3 3 1 1 3 4 2 1 1 1 1 2 1 2 1 5 3 5 2 3 1 3 1 4 2 4 1 3 2 4 2 3 1 4 4 [39] 1 1 3 2 4 2 1 1 1 2 5 1
Example
> x3<-sample(25:50,100,replace=TRUE) > x3
Output
[1] 46 36 31 45 32 38 49 34 47 37 49 42 45 50 43 49 44 35 31 50 41 43 37 41 35 [26] 30 50 36 44 48 36 43 37 27 48 48 33 39 33 38 32 32 33 45 27 33 36 39 39 39 [51] 33 49 50 32 44 27 46 48 49 26 25 50 49 27 25 36 42 45 39 29 31 45 30 34 29 [76] 27 42 36 36 25 37 40 49 34 50 33 50 47 49 45 46 34 25 34 34 37 36 47 39 25
> replace(x3,x3==25,26)
Output
[1] 46 36 31 45 32 38 49 34 47 37 49 42 45 50 43 49 44 35 31 50 41 43 37 41 35 [26] 30 50 36 44 48 36 43 37 27 48 48 33 39 33 38 32 32 33 45 27 33 36 39 39 39 [51] 33 49 50 32 44 27 46 48 49 26 26 50 49 27 26 36 42 45 39 29 31 45 30 34 29 [76] 27 42 36 36 26 37 40 49 34 50 33 50 47 49 45 46 34 26 34 34 37 36 47 39 26
Example
> x4<-rpois(100,5) > x4
Output
[1] 1 4 4 3 3 3 6 4 3 2 6 5 9 3 5 4 1 1 8 5 3 5 7 8 4 [26] 3 5 6 3 4 7 1 6 5 4 7 4 4 4 4 3 5 5 1 11 4 7 3 6 3 [51] 7 2 3 7 7 6 5 7 4 2 5 5 5 8 3 5 7 2 0 8 4 3 6 2 8 [76] 7 3 9 2 4 4 4 6 5 3 4 9 7 9 6 3 11 0 7 2 4 13 8 7 5
> replace(x4,x4==13,11)
Output
[1] 1 4 4 3 3 3 6 4 3 2 6 5 9 3 5 4 1 1 8 5 3 5 7 8 4 [26] 3 5 6 3 4 7 1 6 5 4 7 4 4 4 4 3 5 5 1 11 4 7 3 6 3 [51] 7 2 3 7 7 6 5 7 4 2 5 5 5 8 3 5 7 2 0 8 4 3 6 2 8 [76] 7 3 9 2 4 4 4 6 5 3 4 9 7 9 6 3 11 0 7 2 4 11 8 7 5
Example
> x5<-round(rnorm(100,2),0) > x5
Output
[1] 2 2 0 1 2 3 2 2 1 2 3 1 1 0 1 2 2 3 3 2 2 3 3 2 3 [26] 1 3 1 1 4 4 2 1 3 0 1 2 2 0 2 2 1 2 4 1 -1 2 0 3 3 [51] 2 4 2 2 2 1 2 1 2 3 2 2 2 2 2 3 2 1 2 1 3 2 2 3 1 [76] 1 3 2 3 2 3 3 3 2 2 1 1 0 2 2 3 0 4 2 2 1 5 2 1 4
> replace(x5,x5==-1,0)
Output
[1] 2 2 0 1 2 3 2 2 1 2 3 1 1 0 1 2 2 3 3 2 2 3 3 2 3 1 3 1 1 4 4 2 1 3 0 1 2 [38] 2 0 2 2 1 2 4 1 0 2 0 3 3 2 4 2 2 2 1 2 1 2 3 2 2 2 2 2 3 2 1 2 1 3 2 2 3 [75] 1 1 3 2 3 2 3 3 3 2 2 1 1 0 2 2 3 0 4 2 2 1 5 2 1 4
> replace(x5,x5==5,3)
Output
[1] 2 2 0 1 2 3 2 2 1 2 3 1 1 0 1 2 2 3 3 2 2 3 3 2 3 [26] 1 3 1 1 4 4 2 1 3 0 1 2 2 0 2 2 1 2 4 1 -1 2 0 3 3 [51] 2 4 2 2 2 1 2 1 2 3 2 2 2 2 2 3 2 1 2 1 3 2 2 3 1 [76] 1 3 2 3 2 3 3 3 2 2 1 1 0 2 2 3 0 4 2 2 1 3 2 1 4
> replace(x5,x5==4,3)
Output
[1] 2 2 0 1 2 3 2 2 1 2 3 1 1 0 1 2 2 3 3 2 2 3 3 2 3 [26] 1 3 1 1 3 3 2 1 3 0 1 2 2 0 2 2 1 2 3 1 -1 2 0 3 3 [51] 2 3 2 2 2 1 2 1 2 3 2 2 2 2 2 3 2 1 2 1 3 2 2 3 1 [76] 1 3 2 3 2 3 3 3 2 2 1 1 0 2 2 3 0 3 2 2 1 5 2 1 3
Saving with a new object −
Example
> x5<-replace(x5,x5==-1,0) > x5
Output
[1] 2 2 0 1 2 3 2 2 1 2 3 1 1 0 1 2 2 3 3 2 2 3 3 2 3 1 3 1 1 4 4 2 1 3 0 1 2 [38] 2 0 2 2 1 2 4 1 0 2 0 3 3 2 4 2 2 2 1 2 1 2 3 2 2 2 2 2 3 2 1 2 1 3 2 2 3 [75] 1 1 3 2 3 2 3 3 3 2 2 1 1 0 2 2 3 0 4 2 2 1 5 2 1 4
Example
-replace(x5,x5==5,3) > x5
Output
[1] 2 2 0 1 2 3 2 2 1 2 3 1 1 0 1 2 2 3 3 2 2 3 3 2 3 1 3 1 1 4 4 2 1 3 0 1 2 [38] 2 0 2 2 1 2 4 1 0 2 0 3 3 2 4 2 2 2 1 2 1 2 3 2 2 2 2 2 3 2 1 2 1 3 2 2 3 [75] 1 1 3 2 3 2 3 3 3 2 2 1 1 0 2 2 3 0 4 2 2 1 3 2 1 4
Example
> x5<-replace(x5,x5==4,3) > x5
Output
[1] 2 2 0 1 2 3 2 2 1 2 3 1 1 0 1 2 2 3 3 2 2 3 3 2 3 1 3 1 1 3 3 2 1 3 0 1 2 [38] 2 0 2 2 1 2 3 1 0 2 0 3 3 2 3 2 2 2 1 2 1 2 3 2 2 2 2 2 3 2 1 2 1 3 2 2 3 [75] 1 1 3 2 3 2 3 3 3 2 2 1 1 0 2 2 3 0 3 2 2 1 3 2 1 3
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