rotateleft<-function(vec,offset)
vec[(((0:(length(vec)-1))+offset) %% length(vec)) + 1]
rotateright<-function(vec,offset)rotateleft(vec,length(vec)-offset)
rotatedcols<-
function
(vec
,offsets)do.call(cbind,lapply(offsets,function(x)rotateright(vec,x)))
rotatedcols(1:5,0:2)
is perhaps wh
Thanks very much Gabor
Bill
On Sun, Jul 5, 2009 at 4:44 PM, Gabor
Grothendieck wrote:
> In terms of x this is:
>
> k <- 3
> x <- 1:5
>
> n <- length(x)
> matrix(x, 2*n-1, k)[1:n, ]
>
> On Sun, Jul 5, 2009 at 10:01 AM, Gabor
> Grothendieck wrote:
>> Try this (ignore the warning):
>>
>> k <- 3
>> m
In terms of x this is:
k <- 3
x <- 1:5
n <- length(x)
matrix(x, 2*n-1, k)[1:n, ]
On Sun, Jul 5, 2009 at 10:01 AM, Gabor
Grothendieck wrote:
> Try this (ignore the warning):
>
> k <- 3
> matrix(1:5, 9, k)[1:5, ]
>
>
> On Sun, Jul 5, 2009 at 8:54 AM, William
> Simpson wrote:
>> I want a function t
Try this:
foo <- function(x, ncols){
tail(embed(rep(x, ncols), ncols), length(x))
}
foo(x, 3)
On Sun, Jul 5, 2009 at 9:54 AM, William Simpson wrote:
> I want a function that takes an input vector, the number of columns
> and returns a matrix as follows.
>
> x<- 1:5
>
> foo(x, nc=3)
>
> 1 5
Try this (ignore the warning):
k <- 3
matrix(1:5, 9, k)[1:5, ]
On Sun, Jul 5, 2009 at 8:54 AM, William
Simpson wrote:
> I want a function that takes an input vector, the number of columns
> and returns a matrix as follows.
>
> x<- 1:5
>
> foo(x, nc=3)
>
> 1 5 4
> 2 1 5
> 3 2 1
> 4 3 2
> 5 4 3
>
On Jul 5, 2009, at 8:54 AM, William Simpson wrote:
I want a function that takes an input vector, the number of columns
and returns a matrix as follows.
x<- 1:5
foo(x, nc=3)
1 5 4
2 1 5
3 2 1
4 3 2
5 4 3
See if this gives you any ideas:
sapply(1:3, function(z) { ((x - z) %% 5) +1 } )
Da
I want a function that takes an input vector, the number of columns
and returns a matrix as follows.
x<- 1:5
foo(x, nc=3)
1 5 4
2 1 5
3 2 1
4 3 2
5 4 3
Thanks again for any help.
Bill
__
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman
7 matches
Mail list logo
