Assuming your data frame of users is named 'users', and using your mapping vectors:
users$regions <- '' users$regions[ users$State_Code) %in% NorthEast ] <- 'NorthEast' and repeat for the other regions Or, if you put your mappings in a data frame then it is as simple as merge(yourdataframe, regions) (assuming the data frame of mappings is named 'regions') The regions data frame should have two columns and 50 rows The two columns contain the state codes and their respective regions. How you get that data frame of regions could vary; here's an example using your vectors, but just two of the regions: regions <- data.frame( region= c( rep('NorthEast',length(NorthEast)), rep('MidWest,length(MidWest)) ), State_Code=c(NorthEast,Midwest) ) Note that this is untested. For example, I could easily have mismatched parentheses. The whole thing could also be done using match(), without creating the dataframe of regions. -Don -- Don MacQueen Lawrence Livermore National Laboratory 7000 East Ave., L-627 Livermore, CA 94550 925-423-1062 On 8/8/13 2:33 AM, "Dark" <i...@software-solutions.nl> wrote: >Hi all, > >I have a dataframe of users which contain US-state codes. >Now I want to add a column named REGION based on the state code. I have >already done a mapping: > >NorthEast <- c(07, 20, 22, 30, 31, 33, 39, 41, 47) >MidWest <- c(14, 15, 16, 17, 23, 24, 26, 28, 35, 36, 43, 52) >South <- c(01, 04, 08, 09, 10, 11, 18, 19, 21, 25, 34, 37, 42, 44, 45, 49, >51) >West <- c(02, 03, 05, 06, 12, 13, 27, 29, 32, 38, 46, 50, 53) >Other <- c(40, 48, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 94, >98, 99) > >So for example: >Name State_Code >Tom 20 >Harry 56 >Ben 05 >Sally 04 > >Should become like: >So for example: >Name State_Code REGION >Tom 20 NorthEast >Harry 56 Other >Ben 05 West >Sally 04 South > >Could anyone help me with a clever statement? > > > >-- >View this message in context: >http://r.789695.n4.nabble.com/Add-column-to-dataframe-based-on-code-in-oth >er-column-tp4673335.html >Sent from the R help mailing list archive at Nabble.com. > >______________________________________________ >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. ______________________________________________ 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.