[R] Stacking matrix columns

Rui Barradas
Sun, 06 Aug 2023 23:36:40 -0000

?s 01:15 de 06/08/2023, Iris Simmons escreveu:
> You could also do
>
> dim(x) <- c(length(x), 1)
>
> On Sat, Aug 5, 2023, 20:12 Steven Yen <styen at ntu.edu.tw> wrote:
>
>> I wish to stack columns of a matrix into one column. The following
>> matrix command does it. Any other ways? Thanks.
>>
>>   > x<-matrix(1:20,5,4)
>>   > x
>>        [,1] [,2] [,3] [,4]
>> [1,]    1    6   11   16
>> [2,]    2    7   12   17
>> [3,]    3    8   13   18
>> [4,]    4    9   14   19
>> [5,]    5   10   15   20
>>
>>   > matrix(x,ncol=1)
>>         [,1]
>>    [1,]    1
>>    [2,]    2
>>    [3,]    3
>>    [4,]    4
>>    [5,]    5
>>    [6,]    6
>>    [7,]    7
>>    [8,]    8
>>    [9,]    9
>> [10,]   10
>> [11,]   11
>> [12,]   12
>> [13,]   13
>> [14,]   14
>> [15,]   15
>> [16,]   16
>> [17,]   17
>> [18,]   18
>> [19,]   19
>> [20,]   20
>>   >
>>
>> ______________________________________________
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>> PLEASE do read the posting guide
>> http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>>
>
> 	[[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
Hello,

Yet another solution.


t(t(c(x)))

or

x |> c() |> t() |> t()


At first I liked it but it's the slowest of the three, OP's, Iris'
(the
fastest).

Hope this helps,

Rui Barradas