No subject

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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