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Extracting dataframe rows containing NAs in one column

kaallen 
Hi,

I am working on a data set which looks like this:
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
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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Thread (3 messages)

kaallen Extracting dataframe rows containing NAs in one column Oct 25 Pete Brecknock Extracting dataframe rows containing NAs in one column Oct 25 R. Michael Weylandt Extracting dataframe rows containing NAs in one column Oct 25