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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