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1998 Dec 15
1
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Dear friends. This is again a very simple question, and I hope you will accept it. I have a dataset with variables in columns all with their names. Now I want to add a column indicating simply identity of patients, numbered according to row. There are 34 rows. So I did: >ID <- c(1:34) but was not allowed to >Ptt <- cbind(patients,ID) and was informed that >Error: names attribute