[R] How to detect a sequence of NA values?
smartpink111 at yahoo.com
Wed Jan 8 20:43:15 CET 2014
If missing values are in the beginning
a <- c(NA,NA,NA,NA,1,NA,NA,2)
rl <- rle(is.na(a))
On Wednesday, January 8, 2014 12:56 PM, Richard Kwock <richardkwock at gmail.com> wrote:
a = c(1,NA,NA,4,3,NA,NA,NA,NA,5)
# find position of the non-NAs in the vector
pos = which(!is.na(a))
# this calculates the length by taking the differences between the
#get the max
On Tue, Jan 7, 2014 at 7:36 PM, arun <smartpink111 at yahoo.com> wrote:
> rl <- rle(is.na(a))
> # 3
> I'd like to detect whether a vector contains a sequence of NA values of a certain length. So, for example, if I have a vector a =
> c(1,NA,NA,4,NA,NA,NA,5); how can I find what the longest sequence of NAs is (in this case 3)?
> Note that this is different from simply summing the number of NA values in the vector (which would be 5 in this case)...
> Thanks for your help !
> R-help at r-project.org mailing list
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
More information about the R-help