[R] Insert elements into a vector in a defined positions

[Manuel Ramon]

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 Ramón Fernández
Group of Reproductive Biology (GBR)
University of Castilla-La Mancha (Spain)
mramon at jccm.es
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