On 4/6/2009 9:24 AM, Daren Tan wrote:
I have a vector containing NULL. Referencing to that NULL gives me NA
instead, which disrupt my codes. How can i preserve NULL as it is ?
NULL is not a numeric value, so you can't put it in a numeric vector.
When you tried, it got converted to the numeric value NA.
You can have a list containing NULL, and lists are vectors, but
functions that expect *numeric* vectors generally won't work with them.
Duncan Murdoch
res <- c(1,2,NULL)
res[1]
[1] 1
res[2]
[1] 2
res[3]
[1] NA
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