将因子数字变量转换为R中的因子字符串

Question

I have a vector of numeric:

1 3 2 4 3 3 ...

I want to convert it to a vector of factor, with 1 = "Good" , 2="OK" , "3= "Bad" etc.

Answer 1

We can use factor with levels and labels specified.

set.seed(24)
factor(sample(1:3, 10, replace=TRUE), levels=1:3, 
                       labels= c('Good', 'OK', 'Bad'))

Or a variant suggested by @David Arenburg

factor(c('Good', 'OK', 'Bad')[sample(1:3, 10, replace=TRUE)])