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...rn(NA),xx) or ifelse( all(is.null(xx))==TRUE,return(NULL),xx) but it still doesn't work. How can I write that in my function? With NA, NULL or in another way? Thank you very much for your answers -- View this message in context: http://r.789695.n4.nabble.com/how-to-ignore-NA-with-NA-or-NULL-tp4632287.html Sent from the R help mailing list archive at Nabble.com.