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[Troels Ring]

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 must be the same length as the vector
So, I removed the names
>newname <- names(patients)
>names(patients) <- NULL
>ptt <- cbind(patients,ID)
but still got
Error: names attribute must be the same length as the vector
in spite of
> names(ID)
NULL
> names(patients)
NULL
> attr(patients,"names")
NULL
> attr(ID,"names")
NULL
One thing, is that inconsistent ?
Short of editing my data file, which would not be very difficult in this case, how could I do it ?
Sincerely yours
Troels Ring, MD

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