try function na.locf() from package 'zoo', i.e.,
library(zoo)
x <- c("A","B",NA,NA,"C",NA,NA,NA,NA,"D",NA,NA)
na.locf(x)
I hope it helps.
Best,
Dimitris
----
Dimitris Rizopoulos
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://perswww.kuleuven.be/dimitris_rizopoulos/
Quoting Owen Jones <[EMAIL PROTECTED]>:
I have a vector of data (species names) interspersed with NA values and
I want a function to "fill in the blanks", replacing NA values with
whatever the last species name was.
For example the vector:
"A","B",NA,NA,"C",NA,NA,NA,NA,"D",NA,NA.
should evaluate to:
"A" "B" "B" "B" "C" "C" "C" "C" "C" "D" "D" "D"
I tried to use rle() in a function to do this but have hit a brick wall.
How would YOU do this?
Many thanks,
Owen
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