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How to take transpose of vectors stored in an R list?
We can take the transpose of vectors stored in an R list by using Map function with do.call. For example, if we have a list called LIST that contains say ten vectors then we can transpose these vectors by using the command given below −
do.call(Map,c(f=c,LIST))
Check out the below examples to understand how it works.
Example 1
To take transpose of vectors stored in an R list, use the command given below −
List1<-list(x1=rpois(20,5),x2=rpois(20,1),x3=rpois(20,10)) List1
If you execute the above given command, it generates the following output −
$x1 [1] 4 10 1 4 2 7 9 8 3 9 2 1 2 4 4 7 4 0 4 2 $x2 [1] 2 0 1 1 2 0 0 2 1 1 1 1 0 2 1 1 3 0 1 1 $x3 [1] 14 8 8 10 6 6 12 8 17 5 13 8 8 15 11 16 11 10 13 13
To take transpose of vectors stored in an R list, add the following code to the above command −
List1<-list(x1=rpois(20,5),x2=rpois(20,1),x3=rpois(20,10)) do.call(Map,c(f=c,List1))
Output
If you execute all the above given commands as a single program, it generates the following output −
[[1]] x1 x2 x3 4 2 14 [[2]] x1 x2 x3 10 0 8 [[3]] x1 x2 x3 1 1 8 [[4]] x1 x2 x3 4 1 10 [[5]] x1 x2 x3 2 2 6 [[6]] x1 x2 x3 7 0 6 [[7]] x1 x2 x3 9 0 12 [[8]] x1 x2 x3 8 2 8 [[9]] x1 x2 x3 3 1 17 [[10]] x1 x2 x3 9 1 5 [[11]] x1 x2 x3 2 1 13 [[12]] x1 x2 x3 1 1 8 [[13]] x1 x2 x3 2 0 8 [[14]] x1 x2 x3 4 2 15 [[15]] x1 x2 x3 4 1 11 [[16]] x1 x2 x3 7 1 16 [[17]] x1 x2 x3 4 3 11 [[18]] x1 x2 x3 0 0 10 [[19]] x1 x2 x3 4 1 13 [[20]] x1 x2 x3 2 1 13
Example 2
To take transpose of vectors stored in an R list, use the command given below −
List2<-list(y1=rnorm(20),y2=rnorm(20)) List2
If you execute the above given command, it generates the following output −
$y1 [1] 0.05917548 1.02861792 0.18393866 0.15641054 0.48371132 -0.97462169 [7] -0.08079743 -0.46323450 1.93425942 -1.01678126 0.46897927 -0.17711315 [13] 0.22473314 -0.65702542 0.69822243 0.37815176 0.41582381 -0.18821946 [19] 1.43258693 0.22601076 $y2 [1] -1.3239608 -0.2197707 0.1915578 0.5647687 0.6934978 -0.6755007 [7] 0.9405100 -1.0617483 -0.7765754 -0.4334703 -0.5402686 0.8850059 [13] 1.5196022 1.0401178 1.5100634 0.7502288 0.3609667 2.5214306 [19] -0.6588718 0.7632775
To take transpose of vectors stored in an R list, add the following code to the above command −
List2<-list(y1=rnorm(20),y2=rnorm(20)) do.call(Map,c(f=c,List2))
Output
If you execute all the above given snippets as a single program, it generates the following output: −
[[1]] y1 y2 0.05917548 -1.32396077 [[2]] y1 y2 1.0286179 -0.2197707 [[3]] y1 y2 0.1839387 0.1915578 [[4]] y1 y2 0.1564105 0.5647687 [[5]] y1 y2 0.4837113 0.6934978 [[6]] y1 y2 -0.9746217 -0.6755007 [[7]] y1 y2 -0.08079743 0.94051002 [[8]] y1 y2 -0.4632345 -1.0617483 [[9]] y1 y2 1.9342594 -0.7765754 [[10]] y1 y2 -1.0167813 -0.4334703 [[11]] y1 y2 0.4689793 -0.5402686 [[12]] y1 y2 -0.1771132 0.8850059 [[13]] y1 y2 0.2247331 1.5196022 [[14]] y1 y2 -0.6570254 1.0401178 [[15]] y1 y2 0.6982224 1.5100634 [[16]] y1 y2 0.3781518 0.7502288 [[17]] y1 y2 0.4158238 0.3609667 [[18]] y1 y2 -0.1882195 2.5214306 [[19]] y1 y2 1.4325869 -0.6588718 [[20]] y1 y2 0.2260108 0.7632775
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