na.strings applied to a dataframe

Question

I currently have a dataframe in which there are several rows I would like converted to \"NA\". When I first imported this dataframe from a .csv, I could use na.strings=c(\"A

Answer 1

data[ data == "D" ] = NA

Note that if you were trying to replace NA with "D", the reverse (df[ df == NA ] = "D") will not work; you would need to use df[is.na(df)] <- "D"