[R] Extract NA data rows

typhoong graham.li at eurus-energy.com
Tue Jan 25 08:07:10 CET 2011

hi i have the following dataframe 

x	y
1	345
6	NA
8	123
32	123
12	NA
6	124
7	NA

and i want to extract the data rows which contains "NA" data, I tried


but fail. if you know the answers, please let me know thanks.


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