I have a file that has (1) Line numbers, (2) IDs. A given ID number can appear
in more than one row. For each row with a repeated ID, I want to add a number
that gives the sequence number of the repeated ID number. The R code below
demonstrates what I want to have, without any attempt to produce the result, as
I have no idea how to accomplish my goal.
line <- c(1,2,3,4,5,6,7,8,9,10)
ID<- c(1,1,2,3,4,5,6,7,8,8)
cat("Note lines 1 and 2 both contain ID 1; lines 9 and 10 both contain ID 8")
cbind(line,ID)
Seq <- c(1,2,1,1,1,1,1,1,1,2)
cat("Sequence numbers within ID added to the data")
cbind(line,ID,Seq)
John David Sorkin M.D., Ph.D.
Professor of Medicine
Chief, Biostatistics and Informatics
University of Maryland School of Medicine Division of Gerontology and Geriatric
Medicine
Baltimore VA Medical Center
10 North Greene Street
GRECC (BT/18/GR)
Baltimore, MD 21201-1524
(Phone) 410-605-7119
(Fax) 410-605-7913 (Please call phone number above prior to faxing)
Confidentiality Statement:
This email message, including any attachments, is for the sole use of the
intended recipient(s) and may contain confidential and privileged information.
Any unauthorized use, disclosure or distribution is prohibited. If you are not
the intended recipient, please contact the sender by reply email and destroy
all copies of the original message.
______________________________________________
R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
