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How to combine list elements of different sizes in R?
To combine list elements of different sizes in R, we can use expand.grid function. For Example, if we have a list called LIST that contains elements of different sizes then we can combine those items by using the command given below −
expand.grid(LIST)
Example 1
To combine list elements of different sizes in R, use the following snippet −
List1<-list(x1=rpois(2,2),x2=rpois(2,10),x3=rpois(1,2),x4=rpois(3,5),x5=rpois(2,5)) List1
The respective Outputs as per the sizes will be as follows −
$x1 [1] 2 3 $x2 [1] 6 7 $x3 [1] 2 $x4 [1] 2 4 4 $x5 [1] 3 5
Now, to combine elements of List1 add the following code to the above snippet −
List1<-list(x1=rpois(2,2),x2=rpois(2,10),x3=rpois(1,2),x4=rpois(3,5),x5=rpois(2,5)) expand.grid(List1)
Output
If you execute all the above given snippets as a single program, it generates the following Output −
x1 x2 x3 x4 x5 1 2 6 2 2 3 2 3 6 2 2 3 3 2 7 2 2 3 4 3 7 2 2 3 5 2 6 2 4 3 6 3 6 2 4 3 7 2 7 2 4 3 8 3 7 2 4 3 9 2 6 2 4 3 10 3 6 2 4 3 11 2 7 2 4 3 12 3 7 2 4 3 13 2 6 2 2 5 14 3 6 2 2 5 15 2 7 2 2 5 16 3 7 2 2 5 17 2 6 2 4 5 18 3 6 2 4 5 19 2 7 2 4 5 20 3 7 2 4 5 21 2 6 2 4 5 22 3 6 2 4 5 23 2 7 2 4 5 24 3 7 2 4 5
Example 2
To combine list elements of different sizes in R, use the following snippet −
List2<-list(y1=0:2,y2=c(1,2),y3=c(2,3,4,5)) List2
The respective
Output
s as per the sizes will be as follows −
$y1 [1] 0 1 2 $y2 [1] 1 2 $y3 [1] 2 3 4 5
To combine elements of List2 add the following code to the above snippet −
List2<-list(y1=0:2,y2=c(1,2),y3=c(2,3,4,5)) expand.grid(List2)
Output
If you execute all the above given snippets as a single program, it generates the following Output −
y1 y2 y3 1 0 1 2 2 1 1 2 3 2 1 2 4 0 2 2 5 1 2 2 6 2 2 2 7 0 1 3 8 1 1 3 9 2 1 3 10 0 2 3 11 1 2 3 12 2 2 3 13 0 1 4 14 1 1 4 15 2 1 4 16 0 2 4 17 1 2 4 18 2 2 4 19 0 1 5 20 1 1 5 21 2 1 5 22 0 2 5 23 1 2 5 24 2 2 5
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