On 06/09/2010 1:00 AM, raje...@cse.iitm.ac.in wrote:
Hi,
I have a vector who contents should look like this,
"c" "d" NULL "e" "f" etc
or
4 5 6 NULL 7 8 9
how can I represent the null value?
As others have said, you probably want NA rather than NULL. If you
really want NULL, then use a list (a generic vector). So
x <- list("c", "d", NULL, "e", "f")
y <- list(4,5,6,NULL, 7,8,9)
You need to be careful when setting values, because
y[[1]] <- NULL
will *remove* element 1, not set it to NULL. To set it to NULL, use
y[1] <- list(NULL)
Duncan Murdoch
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