Re: [R] Data replacement
Lisa wrote: I have a dataset that looks like this: data idcode1code2 1 114 2 123 3 244 .. I want to change some numbers in the columns of “code1” and “code2” based on “indx” as below indx [[1]] code 1 1 2 3 3 4 For example, for the first ten records (rows) of my dataset, I want to change 2 to 3, 3 to 4, 4 to 6, and 5 to 8 in both “code1” and “code2”, while for the last ten records, I want to change 3 to 4 and 4 to 6. You might check for recode, for example in package car, or for transform. You could also do it the quick and dirty way, good to learn indexing. Be careful if you have NA in your data, or data out of the recode range. Dieter data = data.frame(code1=sample(1:5,10,TRUE),code2=sample(1:5,10,TRUE)) data = rbind(data,data.frame(code1=sample(1:4,10,TRUE),code2=sample(1:4,10,TRUE))) # The recode table as in your example #indx = list(data.frame(code=c(1,3,4,6,8)),data.frame(code=c(1,2,4,6))) #easier to read recode1 = c(1,3,4,6,8) recode2 = c(1,2,4,6) data$code1T[1:10] = recode1[data$code1[1:10]] data$code2T[1:10] = recode1[data$code2[1:10]] data$code1T[11:20] = recode2[data$code1[11:20]] data$code2T[11:20] = recode2[data$code2[11:20]] -- View this message in context: http://n4.nabble.com/Data-replacement-tp999060p999176.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.
Re: [R] Data replacement
Thank you for your kind help. Your R script works well. Lisa Dieter Menne wrote: Lisa wrote: I have a dataset that looks like this: data idcode1code2 1 114 2 123 3 244 .. I want to change some numbers in the columns of “code1” and “code2” based on “indx” as below indx [[1]] code 1 1 2 3 3 4 For example, for the first ten records (rows) of my dataset, I want to change 2 to 3, 3 to 4, 4 to 6, and 5 to 8 in both “code1” and “code2”, while for the last ten records, I want to change 3 to 4 and 4 to 6. You might check for recode, for example in package car, or for transform. You could also do it the quick and dirty way, good to learn indexing. Be careful if you have NA in your data, or data out of the recode range. Dieter data = data.frame(code1=sample(1:5,10,TRUE),code2=sample(1:5,10,TRUE)) data = rbind(data,data.frame(code1=sample(1:4,10,TRUE),code2=sample(1:4,10,TRUE))) # The recode table as in your example #indx = list(data.frame(code=c(1,3,4,6,8)),data.frame(code=c(1,2,4,6))) #easier to read recode1 = c(1,3,4,6,8) recode2 = c(1,2,4,6) data$code1T[1:10] = recode1[data$code1[1:10]] data$code2T[1:10] = recode1[data$code2[1:10]] data$code1T[11:20] = recode2[data$code1[11:20]] data$code2T[11:20] = recode2[data$code2[11:20]] -- View this message in context: http://n4.nabble.com/Data-replacement-tp999060p999342.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.
