Hi, I have been a matlab user and is learning R.
I want to convert a large list of strings to a list of unique numeric ids to reduce storage space. For example, there is a string list (there are duplicates) ABCDDDD ACCDEDF ACCGEDF ACCGEGF ..... ACCDEDF ACCGEGF and I want to have a corresponding numeric id list 1 2 3 4 .... 2 4 In matlab, the 'unique' function can do this in addition to give the unique set, but in R, 'unique' only gives the unique set Please advice me on this. Thanks, Gang ______________________________________________ R-help@r-project.org mailing list 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.
