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
>
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