try something like this:
vec - c(1, 2, 1, NA, NA, 1, 2, NA, NA, NA, 3, 4, NA, NA)
out - rle(is.na(vec))
table(out$lengths[out$values])
I hope it helps.
Best,
Dimitris
Dimitris Rizopoulos
Ph.D. Student
Biostatistical Centre
School of Public Health
Catholic University of Leuven
Address: Kapucijnenvoer 35, Leuven, Belgium
Tel: +32/(0)16/336899
Fax: +32/(0)16/337015
Web: http://med.kuleuven.be/biostat/
http://www.student.kuleuven.be/~m0390867/dimitris.htm
- Original Message -
From: Marie-Pierre Sylvestre [EMAIL PROTECTED]
To: r-help@r-project.org
Sent: Thursday, October 11, 2007 3:47 PM
Subject: [R] Identifying and characterizing strings of NA in a vector
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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