R help - Nov 2009 - Insert elements into a vector in a defined positions

Dear R users,
I have a vector of length n and I want to insert some elements (in my case
the NA string) into a defined positions. For example, my vector is z1 and I
want to add NA's in positions 4, 6 y 7 so after that, my new vector, z2,
should have a length of 10+3. 

  z1 <- 1:10
  id <- c(4,6,7)

  # And z2 should be: 
  z2 <- c(1,2,3,NA,4,5,NA,NA,6,7,8,9,10)

Anyone knows how can I do that?
Thank you.

-----
Manuel Ram?n Fern?ndez
Group of Reproductive Biology (GBR)
University of Castilla-La Mancha (Spain)
mramon at jccm.es
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On 26/11/2009, at 10:46 AM, Manuel Ramon wrote:
>
> Dear R users,
> I have a vector of length n and I want to insert some elements (in  
> my case
> the NA string) into a defined positions. For example, my vector is  
> z1 and I
> want to add NA's in positions 4, 6 y 7 so after that, my new  
> vector, z2,
> should have a length of 10+3.
>
>   z1 <- 1:10
>   id <- c(4,6,7)
>
>   # And z2 should be:
>   z2 <- c(1,2,3,NA,4,5,NA,NA,6,7,8,9,10)
>
> Anyone knows how can I do that?
At first I thought append() might work ... but the "after"
argument to append seems to have to be of length 1.

How about:

	z2 <- numeric(length(z1)+length(id))
	z2[id] <- NA
	z2[!is.na(z2)] <- z1

A bit kludgy, but it appears to work.

	cheers,

		Rolf Turner

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