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...e following: A [[1]] [,1] [[2]] [,1] I need to store NA in the latter one. I have tried A[is.na(A)] but I get an error message. Any help would be greatly appreciated. Thank you in advance -- View this message in context: http://r.789695.n4.nabble.com/Filling-empty-List-in-a-FOR-LOOP-tp4522694p4522694.html Sent from the R help mailing list archive at Nabble.com.