Hi Maura,

It is not "elegant" but may work.


actual.string<- "12345abcdefgh12345abcdefgh"
actual.string
actual.string<-paste(substr(actual.string,
nchar(actual.string),nchar(actual.string)),
   substr(actual.string, 1,nchar(actual.string)-1), sep="")
actual.string


#in a looping

actual.string<- "12345abcdefgh12345abcdefgh"
number.buffers<-10
my.buffers<-actual.string
for (i in 1:number.buffers)
 {
 actual.string<-paste(substr(actual.string,
nchar(actual.string),nchar(actual.string)),
   substr(actual.string, 1,nchar(actual.string)-1), sep="")
 my.buffers<-c(my.buffers, actual.string)
 }
my.buffers

Ciao,

milton
brazil=toronto
On Sun, May 24, 2009 at 1:09 PM, <mauede@alice.it> wrote:

> Some wavelet analysis experts have implemented periodic boundary conditions
> for signals.
> I need to implement a circular buffer. Something like:
> "12345abcdefgh12345abcdefgh"
>  so that at each step the riightmost element is moved to the leftmost index
> and everything else is properly shifted:
> "h12345abcdefgh12345abcdefg", "gh12345abcdefgh12345abcdef", ....
>
> My implementation (still debugging) seems to start working but is terribly
> clumsy.
> I am sure that some expert can suggest a more elegant solution,
> Thank you.
> Maura
>
>
>
> tutti i telefonini TIM!
>
>
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