Replacing character values with NA in a data frame

Question

I have a data frame containing (in random places) a character value (say "foo") that I want to replace with an NA.

What's the best way to do so across the whole data frame?

Answer 1

To replace character values in a data frame with NA, you can use the following syntax:

df[ df == "foo" ] <- NA

Note that if you were trying to replace NA with "foo", the reverse will not work

 (df[ df == NA ] = "foo") 

You would need to use 

df[is.na(df)] <- "foo"

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