Hi there, I need help with IFELSE function.
The column g of my dataset pth, pth$g consists of "aa", "ao", "dcl", "iy", "sh". The last few values of pth$g looks like: [4496] sh ao ao sh iy dcl dcl aa iy iy aa sh ao ao Levels: aa ao dcl iy sh I want to convert these values into 1,2,3,4,5. I tried to use a loop and I found the following statement did not work. > pth$g[1]<-ifelse(pth$g[1]=="aa",1,pth$g[1]) Warning message: invalid factor level, NAs generated in: `[<-.factor`(`*tmp*`, 1, value = 5L) Then I tried this statement. It works, but I do not understand how it convert the values not only into 1 but also into 2,3,4,5 at the same time. > pth$g<-ifelse(pth$g=="aa",1,pth$g) > pth$g [1] 4 4 3 3 1 4 1 5 .... I appreciate your help. Min (Tilda) Zhang Department of Statistics North Carolina State University ______________________________________________ [email protected] 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.
