Recoding variables with R

Question

Recoding variables in R, seems to be my biggest headache. What functions, packages, processes do you use to ensure the best result?

I\'ve found very few useful exam

Answer 1

I find this very convenient when several values should be transformed (its like doing recodes in Stata):

# load package and gen some data
require(car)
x <- 1:10

# do the recoding
x
## [1]   1   2   3   4   5   6   7   8   9  10

recode(x,"10=1; 9=2; 1:4=-99")
## [1] -99 -99 -99 -99   5   6   7   8   2   1