[R] Fill in NA values in vector with previous character/factor

Owen Jones owen.jones at imperial.ac.uk
Mon Jul 28 20:10:34 CEST 2008

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:


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,


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