R help - Dec 2007 - Inserting a subsequence between values of a vector

Hallo,

suppose I have a vector:

x <- c(1,1,1,2,2,3,3,3,3,3,4)

How can I generate a vector/sequence in which a fixed number of zeroes (say
3) is inserted between the consecutive values, so I get

1,1,1,0,0,0,2,2,0,0,0,3,3,3,3,3,0,0,0,4

thanks a lot,
Serguei
	[[alternative HTML version deleted]]

You could use a combination of rle, cumsum and append.
> x <- c(1,1,1,2,2,3,3,3,3,3,4) 
> y<-rle(x)$lengths
> y
[1] 3 2 5 1
> z<-cumsum(y)[y>1]
> z
[1]  3  5 10
>
> for(i in rev(z)) x <- append(x, c(0,0,0), after = i)
> x
 [1] 1 1 1 0 0 0 2 2 0 0 0 3 3 3 3 3 0 0 0 4


Chris


Serguei Kaniovski-3 wrote:
> 
> 
> Hallo,
> 
> suppose I have a vector:
> 
> x <- c(1,1,1,2,2,3,3,3,3,3,4)
> 
> How can I generate a vector/sequence in which a fixed number of zeroes
> (say
> 3) is inserted between the consecutive values, so I get
> 
> 1,1,1,0,0,0,2,2,0,0,0,3,3,3,3,3,0,0,0,4
> 
> thanks a lot,
> Serguei
> 	[[alternative HTML version deleted]]
> 
> ______________________________________________
> R-help at r-project.org mailing list
> 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.
> 
> 
-- 
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Take the rle, fix up the result and take the invese.rle.  Our formula
adds 0's to the end too so remove those with head:

head(inverse.rle(with(rle(x), list(lengths = c(rbind(lengths, 3)),
values = c(rbind(values, 0))))), -3)

On Dec 4, 2007 10:49 AM, Serguei Kaniovski <Serguei.Kaniovski at
wifo.ac.at> wrote:
>
> Hallo,
>
> suppose I have a vector:
>
> x <- c(1,1,1,2,2,3,3,3,3,3,4)
>
> How can I generate a vector/sequence in which a fixed number of zeroes (say
> 3) is inserted between the consecutive values, so I get
>
> 1,1,1,0,0,0,2,2,0,0,0,3,3,3,3,3,0,0,0,4
>
> thanks a lot,
> Serguei
>        [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at r-project.org mailing list
> 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.
>

library(R.utils)
pos=which(diff(x)==1)+1
insert(x,ats=pos,rep(list(rep(0,3)),length(pos)))

domenico vistocco

Serguei Kaniovski wrote:
> Hallo,
>
> suppose I have a vector:
>
> x <- c(1,1,1,2,2,3,3,3,3,3,4)
>
> How can I generate a vector/sequence in which a fixed number of zeroes (say
> 3) is inserted between the consecutive values, so I get
>
> 1,1,1,0,0,0,2,2,0,0,0,3,3,3,3,3,0,0,0,4
>
> thanks a lot,
> Serguei
> 	[[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at r-project.org mailing list
> 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.
>
>