Welcome to OStack Knowledge Sharing Community for programmer and developer-Open, Learning and Share
Welcome To Ask or Share your Answers For Others

Categories

0 votes
544 views
in Technique[技术] by (71.8m points)

r - Populate NAs in a vector using prior non-NA values?

What's a compact/efficient way to populate NAs using the prior non-NA value? For example:

test = c( 1 , 2 , NA , NA , 5 , NA , 9 , NA , NA )
expected = c( 1 , 2 , 2 , 2 , 5 , 5 , 9 , 9 , 9 )

Here, all of the NA values 'look back' to the first non-NA value. I'm trying to avoid a for loop

See Question&Answers more detail:os

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Answer

0 votes
by (71.8m points)
library(zoo)
na.locf(test)
[1] 1 2 2 2 5 5 9 9 9

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome to OStack Knowledge Sharing Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

...