[R] Matrix

[Gabor Grothendieck]

Assuming that the input is x <- 1:4, try this one-liner:

> embed(c(0*x[-1], x, 0*x[-1]), 4)
     [,1] [,2] [,3] [,4]
[1,]    1    0    0    0
[2,]    2    1    0    0
[3,]    3    2    1    0
[4,]    4    3    2    1
[5,]    0    4    3    2
[6,]    0    0    4    3
[7,]    0    0    0    4

On Mon, Mar 6, 2017 at 11:18 AM, Peter Thuresson
<peter.thuresson at umea.se> wrote:
> Hello,
>
> Is there a function in R which can transform, let say a vector:
>
> c(1:4)
>
> to a matrix where the vector is repeated but "projected" +1 one step down for every (new) column.
> I want the output below from the vector above, like this:
>
> p<-c(1,2,3,4,0,0,0,0,1,2,3,4,0,0,0,0,1,2,3,4,0,0,0,0,1,2,3,4)
>
> matrix(p,7,4)
>

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