[R] Identifying and characterizing strings of NA in a vector
Marie-Pierre Sylvestre
marie-pierre.sylvestre at mail.mcgill.ca
Thu Oct 11 15:47:50 CEST 2007
Dear R users,
I was wondering if someone could suggest a few lines of code for my problem.
I want to count the number and the length of strings of NA in a vector.
For example:
vec <- c(1, 2, 1, NA, NA, 1, 2, NA, NA, NA, 3, 4, NA, NA)
has 2 strings of NA's of length 2 and 1 string of NA' of length 3.
I can easily count the number of NA's per vector, but I am having a hard
time counting the number and length of strings of NA's per vector
without relying heavily on loops. I will have to perform this task for
many vectors.
Can somebody help?
many thanks,
Marie-Pierre
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