Message-ID: <1319560733460-3937361.post@n4.nabble.com>
Date: 2011-10-25T16:38:53Z
From: kaallen
Subject: Extracting dataframe rows containing NAs in one column
Hi,
I am working on a data set which looks like this:
> head(temp)
Day Month Year PW ROW
1 1 1 1959 NA 6.40
2 2 1 1959 6.65 6.35
3 3 1 1959 2.50 3.60
4 4 1 1959 0.60 2.25
5 5 1 1959 0.85 0.30
6 6 1 1959 0.00 2.20
I am trying to extract all the rows containing NA. I can extrat all the rows
without NAs in column 4 using
> PWna<-temp[complete.cases(temp[,4]),]
> head(PWna)
Day Month Year PW ROW
2 2 1 1959 6.65 6.35
3 3 1 1959 2.50 3.60
4 4 1 1959 0.60 2.25
5 5 1 1959 0.85 0.30
6 6 1 1959 0.00 2.20
7 7 1 1959 1.40 1.65
But can't figure out how to extract the rows WITH the NAs. Can anyone advise
me?
Thanks in advance
--
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