Extracting dataframe rows containing NAs in one column
kaallen wrote:
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
I am sure others will have cleaner approaches but how about .... # Data temp = data.frame(Day=1:6,Month=1, Year=c(NA,1959,NA,1959,1959,1959), PW=c(6,7,8,NA,10,11)) # Extract Any Row Containing an NA myNAs = temp[apply(temp,1,function(x) any(is.na(x))),] HTH Pete -- View this message in context: http://r.789695.n4.nabble.com/Extracting-dataframe-rows-containing-NAs-in-one-column-tp3937361p3937523.html Sent from the R help mailing list archive at Nabble.com.