If I understand, you can try this: levels(x)[is.na(as.numeric(levels(x)))] <- 0
On 27/03/2008, Doran, Harold <[EMAIL PROTECTED]> wrote: > I know this comes up, but I didn't see my exact issue in the archives. I > have variables in a dataframe that need to be recoded. Here is what I'm > dealing with > > I have a factor called aa > > > class(aa) > [1] "factor" > > table(aa) > aa > * 0 1 2 3 A B C D L N T > 0 0 1908 725 2089 0 0 67 0 0 2 1 6 > > I need to recode everything that is not a numeric value into a 0. So, > for example > > > mm <- ifelse(aa == 'B', 0, aa) > > table(mm) > mm > 0 3 4 5 11 12 13 > 67 1908 725 2089 2 1 6 > > The recoding works, but the values are no longer what they were > previously. For example, what was a '1' is now a '4' etc. Is there a way > to recode factors and also keep the values the same as they were before? > That is, a '1' would remain a '1' after the recode? > > After the recoding, I need to convert to a numeric variable. I can do > this as > > mm <- as.numeric(as.character(aa)) > > Harold > > > > sessionInfo() > R version 2.6.2 (2008-02-08) > i386-pc-mingw32 > > locale: > LC_COLLATE=English_United States.1252;LC_CTYPE=English_United > States.1252;LC_MONETARY=English_United > States.1252;LC_NUMERIC=C;LC_TIME=English_United States.1252 > > attached base packages: > [1] stats graphics grDevices utils datasets methods base > > > other attached packages: > [1] gdata_2.4.0 > > loaded via a namespace (and not attached): > [1] gtools_2.4.0 > > > > ______________________________________________ > 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. > -- Henrique Dallazuanna Curitiba-Paraná-Brasil 25° 25' 40" S 49° 16' 22" O ______________________________________________ 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.
