I have two structures. I think they are lists, but I am not sure. Both structures contain integers. I am trying to find those members of list b that are found in list a. I have tried to perform the search using grep, but I get an error. Please see code below. I would appreciate knowing how to search listB for any element in listA Thanks John
> str(listA) int [1:42] 13083 13705 14123 14168 14382 14652 14654 14678 14817 14822 ... > str(listB) int [1:633] 13083 13083 13083 13083 13083 13083 13705 13705 13705 13705 ... > grep(listA,listB) [1] 1 2 3 4 5 6 Warning message: In grep(listA, listB) : argument 'pattern' has length > 1 and only the first element will be used 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.
